A319/A320/A321
TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
This document must be used for training purpose only
Under no circumstances should this document be used as a reference.
It will not be updated.
All rights reserved.
No part of this manual may be reproduced in any form,
by photostat, microfilm, retrieval system, or any other means,
without the prior written permission of Airbus Industrie.
A319/A320/A321 TECHNICAL TRAINING MANUAL
_
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
29 HYDRAULIC POWER
UF94200
TABLE OF CONTENTS
Page
** System Presentation (1) ....................... 1
** System Controls (1)............................ 7
** Hydraulic System Users (1) ................... 11
** Circuit Identification and Routing (2) ...... 15
** ECAM Page Presentation (1) ................... 25
** Hydraulic System Warnings (3) ................ 33
** Green Hydraulic System D/O (3)............... 37
** Blue Hydraulic System D/O (3) ................ 45
** Yellow Hydraulic Syst D/O (3) ................ 53
** Leak Measurement System Presentation (3) .... 63
** Hyd. Reservoir Pressurizing Syst D/O (3) .... 69
** Hyd. Reservoir Filling Presentation (2) ..... 75
** Seal Drain System Presentation (2) .......... 79
** Green System Components (3) .................. 87
** Blue System Components (3) .................. 119
** Yellow System Components (3) ................ 151
** Hyd Reservoir PRESS Syst Components (3) .... 185
UF94200
** Power Transfer Unit Components (3) ......... 193
MAINTENANCE PRACTICES
** Reservoir Depressurization (2) ............. 201
** Reservoir Filling (2) ....................... 205
** RAT Stowage and Servicing (2)............... 209
** RAT Test (3) ................................. 215
HYD Leakage (3) ................................. 219
SPECIFIC PAGES
** CFDS Specific Page Presentation (3) ...... 221
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29 HYDRAULIC POWER
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TABLE OF CONTENTS
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29 HYDRAULIC POWER
29 - HYDRAULIC SYSTEM
29-00-00 SYSTEM PRESENTATION
TMUHYD201 LEVEL 1
UF94200
CONTENTS:
General
Reservoirs
Fire Shut-off Valves
Engine Driven Pumps
Electric Pumps
Hand Pump
Ram Air Turbine
Accumulators
Power Transfer Unit
Self Examination
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29 HYDRAULIC POWER
SYSTEM PRESENTATION
GENERAL
FIRE SHUT-OFF VALVES
There are three independent hydraulic systems : Green,
Blue and Yellow.
In normal operation, the green and yellow hydraulic
systems are powered by Engine Driven Pumps (EDPs), and
the blue hydraulic system by an electric pump.
Auxiliary power is provided by an electric pump in the
yellow system.
A bidirectional Power Transfer Unit (PTU) enables the
green system to be powered by the yellow system or
vice versa, without fluid transfer.
A Ram Air Turbine (RAT) is provided in the blue system
for emergency use.
A hand pump is provided in the yellow system for cargo
door manual operation.
On the green and yellow systems, a fire shut-off valve
is positioned upstream of the engine driven pump to
isolate the system.
They are operated by their respective engine fire
pushbutton switches to isolate the engine driven pump
in case of engine fire.
TMUHYD201-T01 LEVEL 1
UF94200
RESERVOIRS
Each hydraulic system has its own reservoir.
It supplies hydraulic fluid to the system pumps, and
is pneumatically pressurized.
The green reservoir is located in the main landing
gear bay, the yellow reservoir in the yellow hydraulic
compartment and the blue reservoir above the blue
ground service panel.
All the reservoirs are filled from the green ground
service panel.
ENGINE DRIVEN PUMPS
The green and yellow systems are each pressurized by
a pump driven respectively by engine 1 and engine 2.
Engine Driven Pumps (EDPs) are located on the accessory
gearbox of each engine. They are of the variable
displacement type.
Normal system operating pressure is 3000 psi
(206 bars).
ELECTRIC PUMPS
The blue system is pressurized by an electric pump.
An electric pump allows the yellow system to be
pressurized enabling ground operations when the
engines are stopped.
Normal system operating pressure is 3000 psi
(206 bars).
HAND PUMP
The hand pump is used to operate the cargo doors when
no electrical power is available.
It is located on the yellow ground service panel.
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SYSTEM PRESENTATION
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RAM AIR TURBINE
A Ram Air Turbine extends automatically in the event
of both engine and APU generator failures and allows
the blue hydraulic system to be pressurized.
RAT delivered pressure is 2500 psi (172 bars).
Manual operation from the cockpit is always possible.
The Ram Air turbine is located in the blue hydraulic
compartment.
NOTE: RAT stowage is possible on ground only.
ACCUMULATORS
An accumulator, in each circuit helps to maintain a
constant pressure during normal operation, by covering
transient demands.
TMUHYD201-T01 LEVEL 1
UF94200
POWER TRANSFER UNIT
A bidirectional Power Transfer Unit enables the green
system to be powered by the yellow system or vice
versa, without fluid transfer.
The PTU is automatically activated when the
differential pressure between the green and yellow
system is higher than 500 psi (34 bars). When the
engines are shut down, the PTU allows the green system
to be pressurized using the yellow electric pump. The
PTU is inhibited during the first engine start and is
automatically tested at second engine start.
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29 HYDRAULIC POWER
SELF EXAMINATION
Which hydraulic systems are pressurized by an
engine driven pump ?
A - Blue and green.
B - Yellow and blue.
C - Green and yellow.
In normal operation, what is the blue hydraulic
system pressurized by ?
A - The Power Transfer Unit.
B - An engine driven pump.
C - An electric pump.
TMUHYD201 LEVEL 1
UF94200
Is it possible to stow the Ram Air Turbine
in flight ?
A - No.
B - Yes.
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29 - HYDRAULIC SYSTEM
29-10-00 SYSTEM CONTROLS
TMUHYD405 LEVEL 1
UF94200
CONTENTS:
Engine 1 Pump
Ram Air Turbine
Blue Electric Pump
Power Transfer Unit
Engine 2 Pump
Yellow Electric Pump
Blue Pump Override
Leak Measurement Valves
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SYSTEM CONTROLS
ENGINE 1 PUMP
ENGINE 2 PUMP
ENG 1 PUMP pushbutton controls the engine 1 hydraulic
pump.
In normal conditions the engine driven pump 1
pressurizes the green system. When the pushbutton is
set to OFF, the pump operates in the depressurized
mode.
ENG 2 PUMP pushbutton controls the engine 2 hydraulic
pump.
In normal conditions the engine driven pump 2
pressurizes the yellow system. When the pushbutton is
set to OFF, the pump operates in the depressurized
mode.
RAM AIR TURBINE
YELLOW ELECTRIC PUMP
The RAT MAN ON guarded pushbutton permits Ram Air
Turbine deployment at any time.
RAT deployment is automatic in case of failure of main
generators (engines and APU) in flight.
The yellow ELEC PUMP pushbutton controls the yellow
electric pump.
BLUE ELECTRIC PUMP
For maintenance purposes, the blue hydraulic circuit
can be pressurized by pressing the BLUE PUMP OVRD
pushbutton on the maintenance overhead panel.
On ground, the electric pump operates, provided the
BLUE PUMP OVRD pushbutton has been pressed in and the
ELEC PUMP pushbutton is set to AUTO.
TMUHYD405-T01 LEVEL 1
UF94200
The blue ELEC PUMP pushbutton controls the blue
electric pump.
With the BLUE ELEC PUMP pushbutton set to AUTO, the
electric pump operates from the moment the first engine
is started until the last engine is shut-down.
When the pushbutton is set to OFF, the pump is
de-energized.
POWER TRANSFER UNIT
The PTU pushbutton controls the arming of the
bidirectional Power Transfer Unit automatic function.
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BLUE PUMP OVERRIDE
LEAK MEASUREMENT VALVES
A leak measurement valve is positioned in each circuit
upstream of the primary flight controls.
Used for the leakage measurement of each circuit, they
are closed, on ground only, by selecting OFF the leak
measurement valve pushbutton switches on the
maintenance overhead panel.
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SYSTEM CONTROLS
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29 - HYDRAULIC SYSTEM
29-00-00 HYDRAULIC SYSTEM USERS
TMUHYD302 LEVEL 1
UF94200
CONTENTS:
Green, Blue, Yellow users
Priority Valves
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29 HYDRAULIC POWER
HYDRAULIC SYSTEM USERS
GREEN, BLUE, YELLOW USERS
The three independent hydraulic systems respectively
supply the users indicated on the diagram.
Between these systems, the users are shared in order
to ensure the aircraft control, even if only one
hydraulic system is inoperative.
On the blue hydraulic system, the Constant Speed
Motor/Generator (CSM/G) is used to provide aircraft
electrical power in case of emergency.
PRIORITY VALVES
TMUHYD302-T01 LEVEL 1
UF94200
In the event of low hydraulic pressure, the priority
valves maintain the operation of essential systems by
cutting off hydraulic power to heavy load users.
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29 HYDRAULIC POWER
HYDRAULIC SYSTEM USERS
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SELF EXAMINATION
TMUHYD302 LEVEL 1
UF94200
What happens if the hydraulic pressure drops ?
A- The priority valves give priority to the
heavy load users.
B- The priority valves give priority to the
essential systems.
C- The priority valves modulate the pressure
to the users.
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29 - HYDRAULIC SYSTEM
29-00-00 CIRCUIT IDENTIFICATION AND
ROUTING
TMUHYAL02 LEVEL 1
UF94200
CONTENTS:
Pipe Routing
Pipe Identification
Component Identification
Connections
Self Examination
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CIRCUIT IDENTIFICATION AND ROUTING
PIPE ROUTING
TMUHYAL02-T01 LEVEL 1
UF94200
The three systems are hydraulically independent.
There are no hydraulic pipes in the passenger cabin
or flight compartment.
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CIRCUIT IDENTIFICATION AND ROUTING
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CIRCUIT IDENTIFICATION AND ROUTING
PIPE IDENTIFICATION
TMUHYAL02-T02 LEVEL 1
UF94200
Each pipe is identified by a self-adhesive label which
indicates:
- The part number of the pipe,
- The identification of the pipe as an hydraulic pipe
(black dots, yellow and blue fields) its function and
the direction of the fluid flow.
- An identification of the system comprising a color
code and a number 1, 2 or 3 respectively indicating
the Green, Blue, or Yellow system.
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CIRCUIT IDENTIFICATION AND ROUTING
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CIRCUIT IDENTIFICATION AND ROUTING
COMPONENT IDENTIFICATION
TMUHYAL02-T03 LEVEL 1
UF94200
Each hydraulic component is identified by a placard
affixed on the structure near to it, which gives its
Functional Item Number (FIN) and its designation.
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CIRCUIT IDENTIFICATION AND ROUTING
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CIRCUIT IDENTIFICATION AND ROUTING
CONNECTIONS
TMUHYAL02-T04 LEVEL 1
UF94200
The most common connections in the hydraulic system
are shown below.
There are two types of connections:
- permanent connections (permaswage).
- removable connections (standard straight or
special fittings).
The manifolds have bobbin type connections for some
components.
The bobbins are equipped with a square seal on the
component side and an o-ring on the manifold side.
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CIRCUIT IDENTIFICATION AND ROUTING
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SELF EXAMINATION
identified by:
number 1.
number 3.
number 2.
TMUHYAL02 LEVEL 1
UF94200
A blue system pipeline is
A - A blue band and
B - A blue band and
C - A blue band and
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29 - HYDRAULIC SYSTEM
29-30-00 ECAM PAGE PRESENTATION
TMUHYD501 LEVEL 1
UF94200
CONTENTS:
Reservoir Quantity
Reservoir Pressure
Reservoir Overheat
Fire Valve
Engine Driven Pumps
Blue Electric Pump
Yellow Electric Pump
Ram Air Turbine
Power Transfer Unit
System Pressure
System Label
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ECAM PAGE PRESENTATION
RESERVOIR QUANTITY
The reservoir quantity indication is green when normal.
It becomes amber at warning level.
RESERVOIR PRESSURE
Reservoir LO AIR PRESS indication appears amber if the
corresponding reservoir air pressure drops below
normal.
RESERVOIR OVERHEAT
Reservoir OVHT indication appears amber if the return
hydraulic fluid temperature is above normal.
FIRE VALVE
TMUHYD501-T01 LEVEL 1
UF94200
The fire valve is green in line when open or not fully
closed and amber cross-line when closed.
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ECAM PAGE PRESENTATION
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ECAM PAGE PRESENTATION
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ECAM PAGE PRESENTATION
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ECAM PAGE PRESENTATION
POWER TRANSFER UNIT
When PTU is running HYD PTU is displayed green on MEMO
display.
SYSTEM PRESSURE
System pressure indication is normally green. It
becomes amber when the system pressure is too low.
3000 -green: System presure is normal.
1430 -amber: System pressure is too low (pressure below
1450 psi=100 bars).
SYSTEM LABEL
TMUHYD501-T04 LEVEL 1
UF94200
System label is a white word and a green arrow when
the pressure is normal.
Both the word and the arrow are amber when pressure
is too low.
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ECAM PAGE PRESENTATION
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29 - HYDRAULIC POWER
29-00-00 HYDRAULIC SYSTEM WARNINGS
TMUHYD602 LEVEL 3
UF94200
CONTENTS:
Green Reservoir Low Air Pressure
Yellow Reservoir Overheat
Blue Reservoir Low Level
Green Engine Pump Low Pressure
Yellow Electric Pump Low Pressure
Dual System Low Pressure
Ram Air Turbine Fault
Power Transfer Unit Fault
Yellow Electric Pump Overheat
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HYDRAULIC SYSTEM WARNINGS
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HYDRAULIC SYSTEM WARNINGS
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29 - HYDRAULIC POWER
29-11-00 GREEN HYDRAULIC SYSTEM D/O
TMUHYDB03 LEVEL 3
UF94200
CONTENTS:
Reservoir
Reservoir Pressurization
Fire Valve
Engine Driven Pump
Ground Couplings
Pressure Switch
Power Transfer Unit
High Pressure Manifold
Leak Measurement Manifold
Power Transfer Unit Manifold
Return Manifold
Self Examination
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GREEN HYDRAULIC SYSTEM D/O
Most of the system components are installed in the
main landing gear compartment.
RESERVOIR
The reservoir is equipped with a direct reading gauge,
a quantity indicator and a low level switch for ECAM
indicating and warning.
Normal fill level: 14 l. (3.7 US gal)
Maximum gaugeable level: 18 l. (4.76 US gal)
Low level warning: 3.0 ± 0.4 l. (0.79 ± 0.1 US gal)
RESERVOIR PRESSURIZATION
The reservoir is normally pressurized with air to
prevent cavitation of the pumps.
The reservoir is pressurized to 50 psi (3.43 bar) and
is sealed to hold the pressure when there is no air
supply.
The threshold of the low pressure switch is 22 psi
(1.52bar).
TMUHYDB03-T01 LEVEL 3
UF94200
FIRE VALVE
ENGINE DRIVEN PUMP
The Engine Driven Pump is attached to the accessory
gearbox. A solenoid valve controlled by the ENG 1 PUMP
push-button selects the pressurized or depressurized
mode.
The Engine Driven Pump cooling and lubricating flow
passes through the case drain filter installed in the
return circuit.
Pump outlet pressure is 3000 psi (206 bar) at zero
flow.
The Engine Driven Pump includes a blocking valve which
isolates the pump from the hydraulic system when the
pump operates in the depressurized mode.
Case drain filter clogging indication: ∆P = 87 ± 8.7 psi
(6 ± 0.6 bar).
GROUND COUPLINGS
The ground service panel consists of two connectors
used to pressurize the green hydraulic system from a
ground cart, a selector valve, two connectors and a
hand pump used for hydraulic reservoir refilling.
The green system fire valve installed in the left hand
wing, inboard of the pylon, is controlled by ENG 1
FIRE push-button.
When the valve closes it stops the supply of fluid to
the Engine Driven Pump.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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TMUHYDB03-P01 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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29 HYDRAULIC POWER
GREEN HYDRAULIC SYSTEM D/O
PRESSURE SWITCH
The pressure switch monitors the Engine Driven Pump
outlet pressure for ECAM indications.
The threshold of pressure switch is 1740 psi (120 bar).
NOTE: A check valve downstream of the pump stops the
fluid flow to the pump if the system is
pressurized by the Power Transfer Unit (PTU).
LEAK MEASUREMENT VALVE
The leak Measurement valve isolates the flight controls
when the guarded LEAK MEASUREMENT VALVES pushbutton
on the maintenance panel is set to OFF.
HP FILTER
The high pressure filter is equipped with a clogging
indicator.
The clogging indicator operates when the differential
pressure is higher than 87 ± 8.7 psi (6 ± 0.6 bar).
POWER TRANSFER UNIT
The Power Transfer Unit will run automatically when
the differential pressure between the green and yellow
circuits is greater than 500 psi (34.5 bar).
The PTU is inhibited during the first engine start and
cargo door operation.
ACCUMULATOR
The accumulator acts as a damper for small changes.
It also makes a supply of fluid available in case of
any demand.
The accumulator is precharged with nitrogen to 1885
psi (130 bar) at 20°C. It holds 1.1l (0.29 USgal) of
total volume of fluid when it is full.
TMUHYDB03-T02 LEVEL 3
UF94200
HIGH PRESSURE MANIFOLD
PRESSURE SWITCHES
The signals from both pressure switches are sent to
the Flight Control Computers, to the Braking Steering
Control Unit, to the ECAM and to the Flight
Augmentation Computer.
The threshold of the pressure switches is 1450 psi
(99.5 bar).
SAMPLING VALVE
A sampling valve is provided on the HP manifold.
PRESSURE RELIEF VALVE
The system relief valve connects the high pressure
circuit to the return circuit in case of overpressure.
The relief valve opens at 3436 psi (237 bar) and closes
at 3190 psi (220 bar).
PRESSURE TRANSDUCER
The pressure transducer provides data for pressure
indication on the ECAM and sends information to ELAC
1 and 2.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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TMUHYDB03-P02 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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29 HYDRAULIC POWER
GREEN HYDRAULIC SYSTEM D/O
LEAK MEASUREMENT MANIFOLD
RETURN MANIFOLD
The leak measurement valve block supplies the flight
controls of the right hand wing, left hand wing and
tail section via three outputs.
Operating a spool valve allows the associated section
to be supplied for leak measurement test.
The return manifold comprises:
- one return filter equipped with a clogging
indicator.
- one temperature transmitter which consists of
one temperature switch and two temperature
transducers.
The bypass operates when the differential pressure across
the filter is more than 29 ± 2.35 psi (2 ± 0.16 bar).
Temperature switch and temperature transducers send
data to the ECAM for warnings.
POWER TRANSFER MANIFOLD
NORMAL BRAKING SELECTOR VALVE
The normal braking selector valve cuts-off
hydraulic supply to the normal brakes.
the
SOLENOID VALVE
The solenoid valve installed in the Power Transfer
Unit supply line stops the Power Transfer Unit
operation.
TMUHYDB03-T03 LEVEL 3
UF94200
PRIORITY VALVE
The priority valve makes sure that all available
hydraulic pressure is sent to the primary flight
controls if pressure in the system is reduced.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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TMUHYDB03-P03 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
SELF EXAMINATION
When is the PTU operation inhibited?
A - Never, it cannot be inhibited.
B - Only if an engine failure has been
detected.
C - In case of cargo door operation with the
yellow electric pump.
TMUHYDB03 LEVEL 3
UF94200
When is the engine fire shut-off valve closed?
A - Automatically when the engine is shut
down.
B - If the ENG FIRE pushbutton is released
out.
C - Automatically as soon as engine fire is
detected.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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29 HYDRAULIC POWER
29 - HYDRAULIC POWER
29-12-00 BLUE HYDRAULIC SYSTEM D/O
TMUHYDC03 LEVEL 3
UF94200
CONTENTS:
Reservoir
Reservoir Pressurization
Electric Pump
Ram Air Turbine
Pressure Switch
High Pressure Manifold
Leak Measurement Manifold
Return Manifold
Ground Couplings
Self Examination
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
BLUE HYDRAULIC SYSTEM D/O
Most of the system components are installed in the
blue hydraulic compartment located in the left hand
belly fairing, forward of the main landing gear
compartment.
RESERVOIR
The reservoir is equipped with a direct reading gauge,
a quantity indicator and a low level switch for ECAM
indicating and warning.
Normal fill level: 6l (1.58 US gal)
Maximum gaugeable level: 8l (2.11 US gal)
Low level warning: between 2.0 and 2.3l (0.52 and 0.6US
gal).
RESERVOIR PRESSURIZATION
ELECTRIC PUMP
With the ELEC PUMP pushbutton set to AUTO, the blue
electric pump will run, if one engine is running, or
BLUE PUMP OVRD pushbutton is set to ON, or Nose Landing
Gear is not compressed and AC power is available from
APU. With the last condition, at touch down a time
delay relay maintains the pump operation for two
minutes after nose landing gear compression.
The pump outlet pressure is 3000 psi (206 bar) at zero
flow.
A temperature switch sends a signal to the ECAM if the
pump body temperature exceeds 165°C.
The electric pump cooling and lubricating flow passes
through the case drain filter installed in the return
circuit.
TMUHYDC03-T01 LEVEL 3
UF94200
The reservoir is normally pressurized with air to
prevent pump cavitation.
The reservoir is pressurized to 50 psi (3.43 bar) and
is sealed to hold the pressure when there is no air
supply.
The threshold of the air pressure switch is 22 psi
(1.52 bar).
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
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TMUHYDC03-P01 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
BLUE HYDRAULIC SYSTEM D/O
RAM AIR TURBINE
The Ram Air Turbine (RAT) is deployed automatically
if all AC electrical power sources are lost at speeds
greater than 100Kts, or manually by using either of
the guarded pushbuttons.
PRESSURE SWITCH
The pressure switch monitors the electric pump pressure
for ECAM indications.
The threshold of the pressure switch is 1450 psi (99.5
bar).
A check valve stops the flow of fluid to the electric
pump if the system is pressurized by the RAT.
HIGH PRESSURE MANIFOLD
TMUHYDC03-T02 LEVEL 3
UF94200
PRESSURE SWITCHES
The signals from both pressure switches are sent to
the ECAM system and to the Flight Control Computers.
The threshold of the pressure switches is 1450 psi
(99.5 bar).
PRESSURE TRANSDUCER
The pressure transducer provides data for pressure
indication on the ECAM and sends information to ELAC
1 and 2.
HP FILTER
The high pressure filter is equipped with a clogging
indicator.
The clogging indicator operates when the differential
pressure is higher than 87 ± 8.7 psi (6 ± 0.6 bar).
ACCUMULATOR
The accumulator acts as a damper for small changes.
It also makes a supply of fluid available in case of
any demand.
The accumulator is precharged with nitrogen to 1885
psi (130 bar) at 20°C. It holds 1.1l (0.29 USgal) of
total volume of fluid when it is full.
PRIORITY VALVE
The priority valve makes sure that all available
hydraulic pressure is sent to the primary flight
controls if pressure in the system is reduced.
PRESSURE RELIEF VALVE
The pressure relief valve connects the high pressure
circuit to the return circuit in case of over pressure.
The relief valve opens at 3436 psi (237 bar) and closes
at 3190 psi (220 bar).
SAMPLING VALVE
A sampling valve is provided on the HP Manifold.
LEAK MEASUREMENT VALVE
The leak measurement valve isolates the flight controls
when the guarded LEAK MEASUREMENT VALVES pushbutton
on the maintenance panel is set to OFF.
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDC03-P02 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
BLUE HYDRAULIC SYSTEM D/O
LEAK MEASUREMENT MANIFOLD
The leak measurement valve block supplies the flight
controls of the right hand wing, left hand wing and
tail section via three outputs.
Operating a spool valve allows the associated section
of the flight controls to be supplied for leak
measurement test.
RETURN MANIFOLD
The return manifold comprises:
- one return filter equipped with a clogging
indicator.
- one temperature transmitter which consists of
one temperature switch and two temperature
transducers.
The bypass operates when the differential pressure
across the filter is more than 29 ± 2.35 psi (2 ± 0.16
bar).
Temperature switch and probes send data to the ECAM
for indication and warnings.
TMUHYDC03-T03 LEVEL 3
UF94200
GROUND COUPLINGS
On ground it is possible to pressurize the blue
hydraulic system from a ground power unit.
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDC03-P03 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
SELF EXAMINATION
When does the electric pump pressurize the blue
system?
A - When the aircraft is on the ground, ELEC
PUMP push-button is set to AUTO and OVRD
(override) push-button is set to ON.
B - When the green and yellow systems are
detected in low pressure configuration.
C - As soon as one engine is running and
OVRD pushbutton is set to ON.
TMUHYDC03 LEVEL 3
UF94200
When does the RAT deploy automatically?
A - In flight, if blue hydraulic power is
lost.
B - As soon as two hydraulic power systems
are lost.
C - At speeds greater than 100Kts, if all
electrical power sources are lost.
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
29 - HYDRAULIC POWER
29-13-00 YELLOW HYDRAULIC SYSTEM D/O
TMUHYDD04 LEVEL 3
UF94200
CONTENTS:
Reservoir
Reservoir Pressurization
Fire Valve
Engine Driven Pump
Ground Couplings
Pressure Switch
Power Transfer Unit
Electric Pump
Hand Pump
High Pressure Manifold
Leak Measurement Manifold
Power Transfer Unit Manifold
Return Manifold
Self Examination
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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29 HYDRAULIC POWER
YELLOW HYDRAULIC SYSTEM D/O
Most of the system components are installed in the
yellow hydraulic compartment, located in the right
hand belly fairing, forward of the main landing gear
compartment.
RESERVOIR
The reservoir is equipped with a direct reading gauge,
a quantity indicator and a low level switch for ECAM
indications and warnings.
Normal fill level: 12 l (3.17 US gal).
Maximum gaugeable level: 18 l (4.76 US gal).
Low level warning: 3 ± 0.4 l (0.79 ± 0.1 US gal).
RESERVOIR PRESSURIZATION
The reservoir is normally pressurized with air to
prevent cavitation of the pumps.
The reservoir is pressurized to 50 psi (3.43 bar) and
is sealed to hold the pressure when there is no air
supply.
The threshold of the air pressure switch is 22 psi
(1.52 bar).
ENGINE DRIVEN PUMP
The Engine Driven Pump is attached to the accessory
gearbox. A solenoid valve controlled by the ENG 2 PUMP
pushbutton selects the pressurized or depressurized
mode.
The Engine Driven Pump cooling and lubricating flow
passes through a case drain filter installed in the
return line.
Pump outlet pressure is 3000 psi (206 bar) at zero
flow.
The Engine Driven Pump includes a blocking valve which
isolates the pump from the hydraulic system when the
pump operates in the depressurized mode.
Case drain filter clogging indication: ∆P = 87 ± 8.7
psi (6 ± 0.6 bar).
GROUND COUPLINGS
On the ground it is possible to pressurize the yellow
hydraulic system from a ground power unit.
TMUHYDD04-T01 LEVEL 3
UF94200
FIRE VALVE
The yellow system fire valve installed in the right
hand wing, inboard of the pylon, is controlled by ENG2
FIRE pushbutton.
When the valve closes it stops the supply of fluid to
the Engine Driven Pump.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
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TMUHYDD04-P01 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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29 HYDRAULIC POWER
YELLOW HYDRAULIC SYSTEM D/O
PRESSURE SWITCH
HAND PUMP
A pressure switch monitors the Engine Driven Pump
outlet pressure for ECAM indications.
The threshold of the pressure switch is 1740 psi (120
bar).
NOTE: A check valve downstream of the pump stops the
fluid flow to the pump if the system is
pressurized by the Power Transfer Unit (PTU) or
by the yellow electric pump.
The hand pump is installed on the ground service panel
of the yellow system and is used for manual cargo door
operation only. On ground, when no electrical power
is available, the hand pump can be used to open or
close the cargo doors.
POWER TRANSFER UNIT
The Power Transfer Unit will run automatically when
the differential pressure between the green and yellow
systems is greater than 500 psi (34.5 bar).
The PTU is inhibited during the first engine start and
cargo door operation.
TMUHYDD04-T02 LEVEL 3
UF94200
ELECTRIC PUMP
The yellow electric pump runs if the ELEC PUMP
pushbutton is set to ON, or if a cargo door selector
is operated.
The electric pump cooling and lubricating flow passes
through the return filter.
In case of cargo door operation, the PTU is inhibited,
the yellow leak measurement valve is closed and a
signal is sent to SFCC2 to prevent flaps movement.
A check valve downstream of the pump stops the fluid
flow to the pump if the system is pressurized from the
Engine Driven Pump or the PTU.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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TMUHYDD04-P02 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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29 HYDRAULIC POWER
YELLOW HYDRAULIC SYSTEM D/O
HIGH PRESSURE MANIFOLD
PRESSURE SWITCHES
The signals from both pressure switches are sent to
the ECAM system, to the Flight Control Computers and
to the Flight Augmentation Computer 2.
The threshold of the pressure switches is 1450 psi
(99.5 bar).
PRESSURE TRANSDUCER
The pressure transducer provides data for pressure
indication on the ECAM and sends information to ELAC
1 and 2.
TMUHYDD04-T03 LEVEL 3
UF94200
LEAK MEASUREMENT VALVE
The leak measurement valve isolates the flight controls
when the guarded LEAK MEASUREMENT VALVES pushbutton
on the maintenance panel is set to OFF.
The solenoid valve is automatically closed if the
yellow electric pump is energized by using cargo door
selectors. This is to prevent any movement of the
flight controls.
ACCUMULATOR
The accumulator acts as a damper for small changes.
It also makes a supply of fluid available in case of
any demand.
The accumulator is precharged with nitrogen to 1885
psi (130 bar) at 20°C. It holds 1.1l (0.29 USgal) of
total volume of fluid when it is full.
SAMPLING VALVE
A sampling valve is provided on the HP manifold.
PRESSURE RELIEF VALVE
The pressure relief valve connects the high pressure
circuit to the return circuit in case of overpressure.
The relief valve opens at 3436 psi (237 bar) and closes
at 3190 psi (220 bar).
HP FILTER
The High Pressure filter is equipped with a clogging
indicator.
The clogging indicator operates when the differential
pressure is higher than 87 ± 8.7 psi (6 ± 0.6 bar).
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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TMUHYDD04-P03 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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29 HYDRAULIC POWER
YELLOW HYDRAULIC SYSTEM D/O
LEAK MEASUREMENT MANIFOLD
Temperature switch and probes send data to the ECAM
for indication and warnings.
The leak measurement valve block supplies the flight
controls of the right hand wing, left hand wing and
tail section via three separate outputs.
Opening a spool valve allows the associated section
of the flight controls to be supplied for leak
measurement test.
PTU MANIFOLD
QUICK DISCONNECT
The quick disconnect is used for maintenance operations
to prevent Power Transfer Unit operation.
PRIORITY VALVE
The priority valve makes sure that all available
hydraulic pressure is sent to the primary flight
controls if pressure in the system is reduced.
SOLENOID VALVE
The solenoid valve, installed in the Power Transfer
Unit supply line, stops the Power Transfer Unit
operation.
TMUHYDD04-T04 LEVEL 3
UF94200
RETURN MANIFOLD
The return manifold comprises:
- a return filter equipped with a clogging
indicator.
- a temperature switch and two temperature
transducers.
The bypass operates when the differential pressure across
the filter is more than 29 ± 2.35 psi (2 ± 0.16 bar).
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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TMUHYDD04-P04 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW HYDRAULIC SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
SELF EXAMINATION
When is the Engine Driven Pump in the depressurized
mode?
A - When the ENG 2 PUMP pushbutton is set to
OFF.
B - The engine pump cannot be depressurized
as long as the engine is running.
C - The engine pump is automatically
depressurized if the output pressure
drops below 1450 psi.
How can the LH wing be supplied independently
during leak measurement test?
A - By setting the leak measurement valve to
OFF and operating the electric pump
B - By pressurizing the yellow system by
using the PTU.
C - By setting the leak measurement valve to
OFF and manually open the LH wing spool
valve.
TMUHYDD04 LEVEL 3
UF94200
What can the
A - To
B - To
C - To
hand pump be used for?
pressurize the reservoir.
check the flight controls.
operate the cargo doors.
During which operation is the leak measurement
valve closed automatically?
A - PTU operation.
B - Cargo door operation.
C - Hand pump operation.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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29 HYDRAULIC POWER
29 - HYDRAULIC POWER
29-19-00 LEAKAGE MEASUREMENT SYSTEM
PRESENTATION
TMUHYDW01 LEVEL 3
UF94200
CONTENTS:
General
Hydraulic System Test
Full System Test
Component Check
EFFECTIVITY
EFFECTIVITY
ALL
29-19-00
Page
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29 HYDRAULIC POWER
LEAKAGE MEASUREMENT SYSTEM PRESENTATION
The yellow system has been chosen as an example.
HYDRAULIC SYSTEM TEST
GENERAL
To test a complete hydraulic system, a hydraulic ground
cart equipped with a flow meter has to be used to
pressurize the circuit.
Precautions: Before starting the test make sure that
all servocontrols are in their neutral
position and that the spoilers are
retracted. Do not forget to disconnect
the isolation coupling of the PTU to
prevent inadvertent pressurization of
the green system by the PTU.
The return flow of a hydraulic system is equal to the
user’s demand flow plus the permanent internal leakage.
Note: Even with users at neutral, there is a permanent
flow. If the permanent flow is too high the
corresponding system operation will be affected.
The flight controls users are permanently supplied
through Leak Measurement Valves. These valves have to
be closed during leak hydraulic system test.
TMUHYDW01-T01 LEVEL 3
UF94200
Internal leakage (full system check) is measured for
each group of users through manually operated shut-off
valves.
The internal leakage flow rate is indicated by the
flow meter.
If the flow rate is too high, a full system check has
to be carried out to find out the faulty group of
hydraulic users (RH wing, LH wing, Tail section,
Central section).
EFFECTIVITY
EFFECTIVITY
ALL
29-19-00
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TMUHYDW01-P01 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
LEAKAGE MEASUREMENT SYSTEM PRESENTATION
EFFECTIVITY
EFFECTIVITY
ALL
29-19-00
Page
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29 HYDRAULIC POWER
LEAKAGE MEASUREMENT SYSTEM PRESENTATION
FULL SYSTEM CHECK
COMPONENT CHECK
Once the hydraulic system is pressurized from the
ground cart, make sure that the ELAC’s, SEC’s and
FAC2 are set to ON to supply the hydraulic users.
Each type of hydraulic component has a maximum
permitted internal leakage limit.
Note: The total leakage of the components within a
section must be less than the permitted maximum
for that section. All together, the total
leakages of the sections must not be more than
the leakage permitted for the complete system.
If the internal leakage is too high, the faulty
component must be identified and replaced.
High leakage rate causes an increase of component
temperature.
If a servocontrol is considered to be faulty, it must
be disconnected and the corresponding hydraulic
section rechecked.
If the internal leakage rate is now within the limits,
the servocontrol is confirmed as defective.
The Flight Controls surfaces must be kept in the
neutral position.
Note: The internal leakage check has to be done with
the hydraulic fluid at its normal working
temperature.
The full system check is carried out by checking
successively the four sections of the hydraulic system
with the corresponding Leakage Measurement Valve in
the closed position.
TMUHYDW01-T02 LEVEL 3
UF94200
The indicated flow must be compared to the theoretical
one and if the flow is over the limit the failed
component belongs to this group of users.
EFFECTIVITY
EFFECTIVITY
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
LEAKAGE MEASUREMENT SYSTEM PRESENTATION
EFFECTIVITY
EFFECTIVITY
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TMUHYDW01 LEVEL 3
UF94200
THIS PAGE LEFT INTENTIONALLY BLANK
EFFECTIVITY
EFFECTIVITY
ALL
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29 - HYDRAULIC POWER
29-14-00 HYDRAULIC RESERVOIR PRESSURIZING
SYSTEM D/O
TMUHYDE05 LEVEL 3
UF94200
CONTENTS:
General
Sources
Restrictor
Reservoir Pressurization Unit
Pressure Reducing Valve
Ground Connector
Filter
Water Separator
Reservoir Check Valves
Pressure Gage
Pressure Relief Valve
Manual Depressurization Valve
Self Examination
EFFECTIVITY
EFFECTIVITY
ALL
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29 HYDRAULIC POWER
HYDRAULIC RESERVOIR PRESSURIZING SYSTEM D/O
GENERAL
PRESSURE REDUCING VALVE
An air pressure system is provided to pressurize each
hydraulic reservoir in order to ensure adequate fluid
supply to the pumps.
Each reservoir is pressurized by air at 50 psi (3.5
bar). The system also remains airtight in the event
of pressurization system failure or after engine
shutdown.
A pressure reducing valve is fitted to the reservoir
pressurization unit.
In normal operation, the delivery pressure of engine
1 has priority over the pressure supply from the
pneumatic manifold.
Pressure reducing valve outlet pressure: 50 psi (3.5
bar).
Two check valves prevent any reverse flow.
SOURCES
GROUND CONNECTOR
The pressure sources are engine 1, via a restrictor
or both engines and the APU, via the pneumatic
manifold. The pressure sources are:
- the engine 1 HP compressor (usual operation).
- the pneumatic system in case of loss of engine1.
- the ground supply.
RESTRICTOR
TMUHYDE05-T01 LEVEL 3
UF94200
A restrictor limits the airflow and reduces the
temperature of the high pressure air to a satisfactory
level.
The restrictor also prevents too much bleed air leakage
in case of a leak downstream of the restrictor.
RESERVOIR PRESSURIZATION UNIT
The reservoir pressurization unit (RPU) controls the
pressure of the air supplied to the reservoirs.
EFFECTIVITY
EFFECTIVITY
ALL
Pressurized air from a ground supply cart goes directly
to the reservoir pressurization unit through a ground
connector.
FILTER
A filter fitted with a clogging indicator is installed
in the reservoir pressurization unit to filter the air
from the different supply sources.
WATER SEPARATOR
A water separator is installed on the reservoir
pressurization unit. It makes sure that the air
delivered to the reservoirs is clear of any fluid.
There are two drain valves which prevent freezing of
the water in the RPU.One is an automatic drain valve
which is opened after each engine or APU shutdown, the
other one is a manual self-sealing drain valve.
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
HYDRAULIC RESERVOIR PRESSURIZING SYSTEM D/O
EFFECTIVITY
EFFECTIVITY
ALL
29-14-00
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29 HYDRAULIC POWER
HYDRAULIC RESERVOIR PRESSURIZING SYSTEM D/O
RESERVOIR CHECK VALVES
MANUAL DEPRESSURIZATION VALVE
Downstream of the reservoir pressurization unit, the
air supply is divided into three flows to supply the
reservoirs through their related check valve. The green
and yellow check valves are installed between the floor
beams above the hydraulic bay and the blue one is
installed in the Aft cargo compartment.
A manual depressurization valve is fitted on each
ground service panel to depressurize each reservoir.
PRESSURE GAGE
WARNING: When using the manual depressurization valve
put on eye protection and keep away from the
outlet of the valve.
The air can be hot and contain particles of
dust and/or hydraulic fluid.
An air pressure gage is installed on each hydraulic
reservoir to indicate the actual pressure. LOW AIR
PRESS warning is generated by the pressure switch if
the pressure is less than 22 psi (1.52 bar).
PRESSURE RELIEF VALVE
TMUHYDE05-T01 LEVEL 3
UF94200
A pressure relief valve, installed on each reservoir,
relieves pressure to the atmosphere in the event of a
system overpressure.
The threshold of the pressure relief valve is 77 psi
(5.3 bar).
EFFECTIVITY
EFFECTIVITY
ALL
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SELF EXAMINATION
When can the APU pressurize the reservoirs?
A - On ground only
B - In flight only
C - A and B
What are the manual depressurization valves
provided for?
A - Individual reservoir depressurization
B - Depressurization of related hydraulic
circuit
C - Hydraulic system depressurization
TMUHYDE05 LEVEL 3
UF94200
What is the purpose of the pressure relief valve?
A - To relieve hydraulic pressure to the
return manifold
B - To relieve excessive air pressure to the
atmosphere
C - To provide overpressure warning to the
ECAM
EFFECTIVITY
EFFECTIVITY
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TMUHYDE05 LEVEL 3
UF94200
THIS PAGE INTENTIONALLY LEFT BLANK
EFFECTIVITY
EFFECTIVITY
ALL
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29 - HYDRAULIC POWER
29-16-00 HYDRAULIC RESERVOIR FILLING
PRESENTATION
TMUHYDF01 LEVEL 2
UF94200
CONTENTS:
Coupling Socket
Restrictor
Hand Pump
Filter
Reservoir Filling Selector Valve
Reservoir Quantity Indicator
Check Valve
Self Examination
EFFECTIVITY
EFFECTIVITY
ALL
29-16-00
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29 HYDRAULIC POWER
HYDRAULIC RESERVOIR FILLING PRESENTATION
COUPLING SOCKET
RESERVOIR FILLING SELECTOR VALVE
The coupling socket is used to fill the reservoir from
a pressurized ground hydraulic supply.
The coupling socket includes a check valve.
The reservoir filling selector valve directs the
hydraulic fluid from the supply source to the reservoir
of the selected system. Do not depressurize the
hydraulic reservoir to refill it.
In the NEUTRAL position, an internal thermal relief
valve protects the selector valve from thermal
expansion of the fluid.
RESTRICTOR
A restrictor located between the coupling socket and
the reservoir filling selector valve protects the
system against over pressure.
HAND PUMP
The hand pump is used to refill the reservoirs if no
ground cart is available.
The hand pump lever is on the yellow ground service
panel. A specific filling valve including a filter and
a check valve is installed on the hand pump.
RESERVOIR QUANTITY INDICATOR
A reservoir quantity indicator allows refilling
monitoring. It shows the contents of the selected
hydraulic reservoir which is indicated by one of the
three colored lights.
The direct reading gauges are used if no electrical
power supply is available.
CHECK VALVE
FILTER
TMUHYDF01-T01 LEVEL 2
UF94200
The filter of the reservoir filling system is equipped
with a clogging indicator.
Note: No bypass possibility on this filter.
EFFECTIVITY
EFFECTIVITY
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The hydraulic fluid is sent to the reservoirs via a
check valve and the filter of the low-pressure return
circuit.
The check valves isolate the main hydraulic systems
from the reservoir filling system when it is not in
use.
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
HYDRAULIC RESERVOIR FILLING PRESENTATION
EFFECTIVITY
EFFECTIVITY
ALL
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29 HYDRAULIC POWER
SELF EXAMINATION
Do the hydraulic reservoirs have to be
depressurized to refill with hydraulic fluid?
A - Yes
B - No
What is the main function of the restrictor?
A - to limit the pressure from the hand pump.
B - to protect the system against
overpressure.
C - to limit thermal expansion of the
hydraulic fluid
TMUHYDF01 LEVEL 2
UF94200
What happens when the filter of the filling circuit
is clogged?
A - the fluid bypasses the filter element.
B - the fluid is stopped; filling is
impossible.
C - the filling pressure has to be increased.
EFFECTIVITY
EFFECTIVITY
ALL
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29 - HYDRAULIC POWER
29-17-00 SEAL DRAIN SYSTEM PRESENTATION
TMUHYAA02 LEVEL 2
UF94200
CONTENTS:
General
Forward system
Aft system
Tank drainage
EFFECTIVITY
EFFECTIVITY
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29 HYDRAULIC POWER
SEAL DRAIN SYSTEM PRESENTATION
GENERAL
The seal drain system collects hydraulic fluid from
the seal drains of some hydraulic components.
The hydraulic fluid which may escape from some
hydraulic components (leak or abnormal condition such
as hydraulic reservoir overfilling or internal
overpressure) is drained into collector tanks.
FORWARD SYSTEM
TMUHYAA02-T01 LEVEL 2
UF94200
The forward system consists of flexible hoses and rigid
pipes connected to a collector tank.
The forward collector tank is attached between the
frames 40 and 41 in the yellow hydraulic compartment.
The components which are drained into the forward
collector tank located in the yellow hydraulic
compartment are:
- Blue electric pump
- Yellow electric pump
- Slats Power Control Unit (PCU)
- Green hydraulic reservoir
- Yellow hydraulic reservoir
EFFECTIVITY
EFFECTIVITY
ALL
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
SEAL DRAIN SYSTEM PRESENTATION - GENERAL - FORWARD SYSTEM
EFFECTIVITY
EFFECTIVITY
ALL
29-17-00
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SEAL DRAIN SYSTEM PRESENTATION
AFT SYSTEM
TMUHYAA02-T02 LEVEL 2
UF94200
The aft system consists of flexible hoses and rigid
pipes connected to a collector tank.
The aft collector tank is attached to the right side
of the keel beam in the main hydraulic compartment.
The components which are drained into the aft collector
located in the main landing gear compartment are:
- Flaps Power Control Unit (PCU)
- Power Transfer Unit (PTU)
- Constant Speed Motor / Generator (CSM / G)
- Blue hydraulic reservoir
EFFECTIVITY
EFFECTIVITY
ALL
29-17-00
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
SEAL DRAIN SYSTEM PRESENTATION - AFT SYSTEM
EFFECTIVITY
EFFECTIVITY
ALL
29-17-00
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29 HYDRAULIC POWER
SEAL DRAIN SYSTEM PRESENTATION
TANK DRAINAGE
TMUHYAA02-T03 LEVEL 2
UF94200
The system is designed so that the hydraulic fluid
drains into the collector tanks by gravity.
The collector tanks attached to the aircraft structure
by means of quick release clamps must be removed for
drainage.
Each collector tank, which has a capacity of 0.75
liters (0.19 US Gal), must be emptied and cleaned at
regular intervals.
EFFECTIVITY
EFFECTIVITY
ALL
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
SEAL DRAIN SYSTEM PRESENTATION - TANK DRAINAGE
EFFECTIVITY
EFFECTIVITY
ALL
29-17-00
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TMUHYAA02 LEVEL 2
UF94200
THIS PAGE INTENTIONALLY LEFT BLANK
EFFECTIVITY
EFFECTIVITY
ALL
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29 HYDRAULIC POWER
29 - HYDRAULIC POWER
29-11-00 GREEN SYSTEM COMPONENTS
TMUHYDI03 LEVEL 3
UF94200
CONTENTS:
Leakage Measurement Manifold
High Pressure Manifold
Engine Driven Pump 1
EDP 1 Case Drain Filter
EDP 1 Pressure Switch
Engine Fire Valve
Reservoir
Return Manifold
Ground Service Panel
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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GREEN SYSTEM COMPONENTS
SAFETY PRECAUTIONS
LEAKAGE MEASUREMENT MANIFOLD
WARNING: When using the manual depressurization valve
put on hand and eye protection and keep away
from the outlet of the valve. The air can be
hot and contain particles of dust and/or
hydraulic fluid.
IDENTIFICATION
FIN : 1146 GM
LOCATION
ZONE : 145
TMUHYDI03-T01 LEVEL 3
UF94200
DESCRIPTION
The ground leakage measurement manifolds of the three
hydraulic systems are identical.The manifold has two
pairs of inlet ports, identified as A and B. As only
one pair is used, the other one is sealed.The three
outlet ports are identified as C, D and E.The 2-way
spool valves are manually opened for ground maintenance
tasks only.
EFFECTIVITY
EFFECTIVITY
ALL
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - LEAKAGE MEASUREMENT MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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HIGH PRESSURE MANIFOLD
FILTER
IDENTIFICATION
FIN: 1011GM
IDENTIFICATION
FIN: 1048GM
LOCATION
ZONE: 147
LOCATION
ZONE: 147
DESCRIPTION
The HP manifold has ports which connect it to the other
parts:
- a system pressure inlet from pumps and ground
supply
- Two outlets to the Leak Measurement System
Manifold
- One outlet and one inlet to the PTU manifold
- One connection to the accumulator/cargo doors
selector valve/brake manifold.
DESCRIPTION
The filter element is of the replaceable type. It
cannot be cleaned.
The filter also includes a clogging indicator which
has to be reset manually after replacement of the
filter element.
An anti-spill device is also included in the filter
in order to prevent any hydraulic fluid flow when the
filter element and the bowl are removed.
The HP filter has a filtration rating of 15 microns.
TMUHYDI03-T02 LEVEL 3
UF94200
GREEN SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - HP MANIFOLD COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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PRESSURE TRANSDUCER
FLUID SAMPLING VALVE
IDENTIFICATION
FIN: 1065GN
IDENTIFICATION
FIN: 1187GM
LOCATION
ZONE: 146
LOCATION
ZONE: 146
DESCRIPTION
The pressure transducer measures the system pressure
and sends signals to the SDAC for ECAM display and to
ELAC 1/2 for Flight Control System.
DESCRIPTION
The sampling valve makes it possible to take samples
of fluid for analysis with the system at full pressure.
The end cap provided with a slot is used as a tool to
open the valve.
TMUHYDI03-T03 LEVEL 3
UF94200
GREEN SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - HP MANIFOLD COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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PRESSURE RELIEF VALVE
LEAKAGE SOLENOID VALVE
IDENTIFICATION
FIN: 1063GM
IDENTIFICATION
FIN: 1150GP
LOCATION
ZONE: 146
LOCATION
ZONE: 146
DESCRIPTION
The pressure relief valve protects the system from
overpressure.It opens at 237 bar (3436 psi) and closes
at 220 bar (3190 psi).
DESCRIPTION
The leakage solenoid valve controls the fluid flow to
the leakage measurement system manifold.It is normally
open. During ground operation of the system, the valve
is closed to connect the HP outlet port to the return
circuit and thus shuts the HP inlet port.
TMUHYDI03-T04 LEVEL 3
UF94200
GREEN SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - HP MANIFOLD COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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PRESSURE SWITCHES
ACCUMULATOR
IDENTIFICATION
FIN: 1151GN, 10CE-2
IDENTIFICATION
FIN: 1070GM
LOCATION
ZONE: 146
LOCATION
ZONE: 146
DESCRIPTION
The two pressure switches monitor the system pressure,
and send a signal at both low and high pressure.
The pressure switch 1151GN sends information to the
FWC, the flight control system and the auto flight
system.
The pressure switch 10CE-2 sends information to the
flight control system only.
DESCRIPTION
The accumulator is of the cylindrical type with an
internal bladder. The metal body has an outer layer
of kevlar to make it stronger. The accumulator is
precharged with nitrogen to 130bar (1885psi) at 20oC.
It holds 1liter (0,26 US gal) of usable fluid when it
is full. The bladder is made of rubber and isolates
the nitrogen gas from the hydraulic fluid. A nitrogen
charging valve (shrader type) and a direct reading
pressure gage are installed on the accumulator.
TMUHYDI03-T05 LEVEL 3
UF94200
GREEN SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - HP MANIFOLD COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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GREEN SYSTEM COMPONENTS
ENGINE DRIVEN PUMP 1
IDENTIFICATION
FIN: 1030GK
LOCATION
ZONE: 435
TMUHYDI03-T06 LEVEL 3
UF94200
DESCRIPTION
The Engine Driven Pump (EDP), which is of the variable
displacement type, is attached to the accessory gearbox
on the bottom of the engine via keyhole slots and
installation bolts. The suction line has a quick
disconnect self-sealing coupling to facilitate pump
removal/installation.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - ENGINE DRIVEN PUMP
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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GREEN HYDRAULIC COMPONENTS
EDP 1 CASE DRAIN FILTER
IDENTIFICATION
FIN: 1084GM
LOCATION
ZONE: 435
TMUHYDI03-T07 LEVEL 3
UF94200
DESCRIPTION
The filter is equipped with a pop-out clogging
indicator. It operates when the differential pressure
across the filter is 87 ± 8.7 psi (6± 0.6 bar).There
is no bypass device if the filter element is clogged.
The filtration rating is 15 microns.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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TMUHYDI03-P07 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - EDP 1 CASE DRAIN FILTER
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
EDP 1 PRESSURE SWITCH
ENGINE FIRE VALVE
IDENTIFICATION
FIN: 1074GK
IDENTIFICATION
FIN: 1046GK
LOCATION
ZONE: 435
LOCATION
ZONE: 574
DESCRIPTION
The switch monitors the output pressure of the
engine driven pump.It sends a low pressure signal
at 1740 ± 72.5 psi (120 ± 5 bar pressure decreasing)
and stops the signal when the pressure reaches 2200
psi (152 bar pressure increasing).
DESCRIPTION
The fire valve, which is of the ball valve type is
installed in the LH wing between the rear spar and the
false rear spar inboard of the pylon. The electric
motor is a 28 VDC type motor. An indicator, visible
through a window provided in the valve housing, shows
the valve position (open or shut).
TMUHYDI03-T08 LEVEL 3
UF94200
GREEN SYSTEM COMPONENTS
EFFECTIVITY
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TMUHYDI03-P08 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - EDP 1 PRESSURE SWITCH AND ENGINE FIRE VALVE
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS
RESERVOIR
IDENTIFICATION
FIN: 1000GQ
LOCATION
ZONE: 148
TMUHYDI03-T09 LEVEL 3
UF94200
DESCRIPTION
The reservoir is made of two moulded light alloy
sections welded together. The top of the reservoir has
a manifold for the components of the air pressurization
system. The reservoir is divided into two parts. The
lower part is always full. A transfer tube enables
hydraulic fluid exchange with the upper part which
constitutes the fluid reserve.
EFFECTIVITY
EFFECTIVITY
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TMUHYDI03-P09 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - RESERVOIR
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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29 HYDRAULIC POWER
DRAIN VALVE
LOW LEVEL SWITCH
IDENTIFICATION
FIN: 1264GM
IDENTIFICATION
FIN: 1062GQ
LOCATION
ZONE: 148
LOCATION
ZONE: 148
DESCRIPTION
A hollow type drain valve is installed at the bottom
of the reservoir. The valve is opened by turning
(counter-clockwise) and pushing the bushing/valve pin
assembly. Then the bushing is rotated clockwise to
lock the valve in the open position.
DESCRIPTION
The low level switch is a float operated switch which
includes a relay and a magnet which keeps the contacts
open when the float is high. A metal shroud around the
float operates as a damper for small changes in the
fluid level.
TMUHYDI03-T10 LEVEL 3
UF94200
GREEN SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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TMUHYDI03-P10 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - RESERVOIR COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
Page107
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS
AIR PRESSURE GAGE
AIR RELIEF VALVE
IDENTIFICATION
FIN: 1383GM
IDENTIFICATION
FIN: 1005GM
LOCATION
ZONE: 148
LOCATION
ZONE: 148
DESCRIPTION
The reservoir pressure gage displays the air pressure
in a range of 0-75 psi (0-5 bar).
DESCRIPTION
The air relief valve relieves pressure to the
atmosphere in the event of a system overpressurization
(77 psi/5.3 bar).
AIR PRESSURE SWITCH
IDENTIFICATION
FIN: 1384GH
LOCATION
ZONE: 148
TMUHYDI03-T11 LEVEL 3
UF94200
DESCRIPTION
The air pressure switch closes when the pressure
decreases to 22 ± 1.5 psi (1.5 ± 0.1 bar).The contacts
open when the pressure increases to 25 psi (1.7 bar).
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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TMUHYDI03-P11 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - RESERVOIR COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS
LEVEL TRANSMITTER
IDENTIFICATION
FIN: 1001GQ
LOCATION
ZONE: 148
TMUHYDI03-T12 LEVEL 3
UF94200
DESCRIPTION
The level transmitter permits:
- Direct reading of the hydraulic fluid level.
- Transmission of the level indication to the cockpit.
It includes an arm fitted with a float which drives a
gear train on a magnetic coupling. The synchro
transmitter shaft supports a pointer to permit direct
reading of the fluid level.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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TMUHYDI03-P12 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - RESERVOIR COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
Page111
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29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS
RETURN MANIFOLD
TEMPERATURE TRANSMITTER
The LP return manifold is the connection point for
return lines from different parts of the LP system.
The LP filter and a temperature transmitter are
directly connected to the manifold.
IDENTIFICATION
FIN: 1381GR
LOCATION
ZONE: 148
LP RETURN FILTER
IDENTIFICATION
FIN: 1002GM
LOCATION
ZONE: 148
TMUHYDI03-T13 LEVEL 3
UF94200
DESCRIPTION
The LP RETURN filter has a filtration rating of 3
microns. The bypass device allows fluid to go from the
inlet to the outlet without filtration.
DESCRIPTION
The temperature transmitter connected to the SDAC
comprises:
- a temperature switch which operates at 95 ± 2.2°C
(203 ± 4°F).
- two temperature transmitters which measure
fluid temperature between -55°C (+131°F)
and 120°C (248°F).
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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TMUHYDI03-P13 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - RETURN MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
Page113
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS
GROUND SERVICE PANEL
RESERVOIR QUANTITY INDICATOR
GROUND TEST CONNECTORS
IDENTIFICATION
FIN: 1834GQ
IDENTIFICATION
FIN: 1008GM, 1006GM
LOCATION
ZONE: 197
DESCRIPTION
The delivery ground connector (1008GM) and suction
ground connector (1006GM) are of the self-sealing type.
LOCATION
ZONE: 197
DESCRIPTION
The indicator has three coloured scales, one for each
reservoir. Three lights: two Light Emitting Diodes
(LEDs) for green and yellow, and filament lamp for
blue, indicate which system the indicator is set to.
RESERVOIR DEPRESSURIZATION VALVE
IDENTIFICATION
FIN: 1087GM
TMUHYDI03-T14 LEVEL 3
UF94200
LOCATION
ZONE: 197
DESCRIPTION
The reservoir depressurization valve is a manually
operated 2-way valve. It is normally closed by spring
force. It opens by turning the cap assembly or by
connecting the ground depressurization coupling.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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TMUHYDI03-P14 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS - GROUND SERVICE PANEL
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
RESERVOIR FILLING SELECTOR
FILLING FILTER
IDENTIFICATION
FIN: 1134GQ
IDENTIFICATION
FIN: 1132GM
LOCATION
ZONE: 197
LOCATION
ZONE: 197
DESCRIPTION
The reservoir filling selector valve assembly has two
main parts:
- the hydraulic selector unit which controls the
flow of fluid to the reservoirs.
- the electrical switch unit which controls the
electrical supply to the quantity indicator.
DESCRIPTION
The mechanical clogging indicator of the HP filling
filter has a thermal lock which inhibits its operation
when the fluid temperature decreases to 0°C (32°F).
The thermal lock releases when the fluid temperature
increases to 30°C (86°F).
TMUHYDI03-T14 LEVEL 3
UF94200
GREEN SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
Page
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29 HYDRAULIC POWER
GREEN SYSTEM COMPONENTS
FILLING HAND PUMP
IDENTIFICATION
FIN: 1009GM
LOCATION
ZONE: 197
DESCRIPTION
The Hand Pump is a two stroke type pump and supplies
40 ml per stroke at a low pressure or 10 ml per stroke
at a high pressure. The hand pump includes a manually
operated filling valve which is also used as a flexible
hose connector.
RESERVOIR FILLING CONNECTOR
IDENTIFICATION
FIN: 1007GM
TMUHYDI03-T14 LEVEL 3
UF94200
LOCATION
ZONE: 197
DESCRIPTION
The reservoir filling connector is half of a
self-sealing quick-disconnect coupling.
The filling valve also incorporates a filter and a
check valve.
EFFECTIVITY
EFFECTIVITY
ALL
29-11-00
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29 HYDRAULIC POWER
TMUHYDI03 LEVEL 3
UF94200
THIS PAGE INTENTIONALLY LEFT BLANK
EFFECTIVITY
EFFECTIVITY
ALL
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29 HYDRAULIC POWER
29 - HYDRAULIC POWER
29-12-00 BLUE SYSTEM COMPONENTS
TMUHYDJ02 LEVEL 3
UF94200
CONTENTS:
Leakage Measurement Manifold
High Pressure Manifold
Electric Pump Protection
Electric Pump
Ram Air Turbine
Reservoir
Return Manifold
Ground Service Panel
EFFECTIVITY
EFFECTIVITY
ALL
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29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
SAFETY PRECAUTIONS
LEAKAGE MEASUREMENT MANIFOLD
WARNING: When using the manual depressurization valve,
put on hand and eye protection and keep away
from the outlet of the valve. The air can be
hot and contain particles of dust and/or
hydraulic fluid.
IDENTIFICATION
FIN: 2146GM
LOCATION
ZONE: 195
TMUHYDJ02-T01 LEVEL 3
UF94200
DESCRIPTION
The supply of all the consumers other than the slat
motor and the CSM/G goes through the leakage
measurement manifold.
The ground leakage measurement manifolds of the three
hydraulic systems are identical.
The manifold has two pairs of inlet ports identified
as A and B.
As only one pair is used, the other one is sealed. The
three outlet ports are identified as C, D and E.
The 2-way spool valves are manually opened for ground
maintenance tasks only.
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
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TMUHYDJ02-P01 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS - LEAKAGE MEASUREMENT MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
121
Page
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29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
HIGH PRESSURE MANIFOLD
IDENTIFICATION
FIN: 2011GM
LOCATION
ZONE: 195
TMUHYDJ02-T02 LEVEL 3
UF94200
DESCRIPTION
The supply of most of the consumers goes through the
HP manifold.
The HP manifold is installed in the blue hydraulic
compartment.
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
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122
Page
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TMUHYDJ02-P02 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS - HP MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
123
Page
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29 HYDRAULIC POWER
PRIORITY VALVE
FLUID SAMPLING VALVE
IDENTIFICATION
FIN: 2064GM
IDENTIFICATION
FIN: 2187GM
LOCATION
ZONE: 195
LOCATION
ZONE: 195
DESCRIPTION
The priority valve ensures sure that all available
hydraulic pressure is sent to the primary flight
controls if the pressure in the system is reduced.
DESCRIPTION
The sampling valve makes it possible to take samples
of fluid for analysis with the system at full pressure.
The end cap provided with a slot is used as a tool to
open the valve.
TMUHYDJ02-T03 LEVEL 3
UF94200
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
124
Page
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TMUHYDJ02-P03 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS - BLUE HP MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
125
Page
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29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
LEAKAGE SOLENOID VALVE
PRESSURE SWITCHES
IDENTIFICATION
FIN: 2150GP
IDENTIFICATION
FIN: 2151GN, 10CE-1
LOCATION
ZONE: 195
LOCATION
ZONE: 195
DESCRIPTION
The leakage solenoid valve controls the flow of the
fluid to the leakage measurement system manifold. It
is normally open.
During ground operation of the system, the solenoid
valve can be operated from the maintenance panel 50VU
in the flight compartment, to isolate the primary
flight users. In this case, the valve is closed to
connect the HP outlet port to the return port and shut
the HP inlet port.
DESCRIPTION
Two pressure switches send a low pressure signal at
1450 ± 72.5 psi (95 ± 5 bar) (pressure decreasing) and
send a high pressure signal at 1750 psi (120 bar)
(pressure increasing). The pressure switch 2151GN
sends information to the FWC and the Flight Control
System. The pressure switch 10CE-1 sends information
to the Flight Control System only.
PRESSURE RELIEF VALVE
IDENTIFICATION
FIN: 2063GM
TMUHYDJ02-T04 LEVEL 3
UF94200
LOCATION
ZONE: 195
DESCRIPTION
The pressure relief valve protects the system from
overpressure.
It opens at 3436 psi (237 bar) and closes at 3190 psi
(220 bar).
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
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TMUHYDJ02-P04 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
127
Page
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
PRESSURE TRANSDUCER
ACCUMULATOR
IDENTIFICATION
FIN: 2065GN
IDENTIFICATION
FIN: 2070GM
LOCATION
ZONE: 195
LOCATION
ZONE: 195
DESCRIPTION
The pressure transducer measures the system pressure
and sends signals to the ELAC 1/2 for Flight Control
System and to the SDAC for ECAM display. The transducer
is a sealed unit.
DESCRIPTION
The accumulator is of the cylindrical type with an
internal bladder.
The metal body has an outer layer of kevlar to make
it stronger.
The accumulator is precharged with nitrogen to 1885
psi (130 bar) at 20°C.
The bladder is made of rubber and isolates the nitrogen
gas from the hydraulic fluid. It holds 1 liter
(0,26 US gal) of usable fluid when it is full.
HP FILTER
IDENTIFICATION
FIN: 2048GM
TMUHYDJ02-T05 LEVEL 3
UF94200
LOCATION
ZONE: 195
DESCRIPTION
The filter element is of the replaceable type. It
cannot be cleaned. The filter also includes a clogging
indicator which has to be reset manually after
replacement of the filter element.
An anti-spill device is also included in the filter
in order to prevent any hydraulic fluid flow when the
filter element and the bowl are removed.
EFFECTIVITY
EFFECTIVITY
ALL
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TMUHYDJ02-P05 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
ELECTRIC PUMP PROTECTION
IDENTIFICATION
FIN: 2706GJ, 2707GJ
LOCATION
ZONE: 126
TMUHYDJ02-T06 LEVEL 3
UF94200
DESCRIPTION
A current transformer and a phase unbalance detector
provide protection if there is a fault in the electric
pump motor or in the supply. The current transformer
compares the flow of current in each phase of the AC
motor supply.
If a difference is detected, the current transformer
sends a signal to the phase unbalance detector which
stops the pump motor.
A test pushbutton is provided on the phase unbalance
detector to simulate current transformer operation.
An indicator light comes on to show that both units
have operated correctly.
EFFECTIVITY
EFFECTIVITY
ALL
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TMUHYDJ02-P06 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
ELECTRIC PUMP
CASE DRAIN FILTER
IDENTIFICATION
FIN: 2075GJ
IDENTIFICATION
FIN: 2084GM
LOCATION
ZONE: 195
LOCATION
ZONE: 195
DESCRIPTION
The electric pump of the blue hydraulic system is
installed in the blue hydraulic compartment. It is
interchangeable with the yellow electric pump.
DESCRIPTION
The case drain filter is equipped with a pop-out
clogging indicator. It operates when the differential
pressure across the filter is 87 ± 8.7psi (6 ± 0.6 bar).
There is no by-pass device if the filter element is
clogged. The filtration rating is 15 microns.
TMUHYDJ02-T07 LEVEL 3
UF94200
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDJ02-P07 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
PRESSURE SWITCH
PULSATION DAMPENER
IDENTIFICATION
FIN: 2074GJ
IDENTIFICATION
FIN: 2092GM
LOCATION
ZONE: 195
LOCATION
ZONE: 195
DESCRIPTION
The pressure switch is installed downstream of the
electric pump to monitor the output pressure. It sends
a signal to the ECAM and a local warning to display
the blue pump low pressure warning.
DESCRIPTION
The pulsation dampener, which is a metal sphere, is
installed in the pump outlet line to remove pulses
from the HP flow.
TMUHYDJ02-T08 LEVEL 3
UF94200
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDJ02-P08 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
RAM AIR TURBINE (RAT)
RAT ACTUATOR
IDENTIFICATION
FIN: 2GE
IDENTIFICATION
FIN: 1GE
LOCATION
ZONE: 195
LOCATION
ZONE: 195
DESCRIPTION
The RAT is installed in the LH belly fairing. It is
extended into the airflow by an actuator. RAT
retraction is only possible when the aircraft is on
ground.
The RAT is a constant speed unit with two 39.5 inch
(1m) variable pitch blades. The RAT is extended and
locked in position by means of a RAT actuator.
A RAT de-icing device prevents icing conditions at the
turbine hub by producing heat, which keeps the nose
temperature to 3 deg.C minimum. Heat is produced by
the eddy current device composed of two basic
components: an aluminium plate and an even number of
magnets.
DESCRIPTION
The RAT actuator is installed between the aircraft
structure and the RAT leg assembly. It is used for RAT
extension and retraction. It is extended by spring
force and retracted by hydraulic power. The jack is
mechanically locked in both the extended and retracted
positions. RAT extension is controlled by two solenoids
located at the top of the actuator. A ground retraction
module controls the retraction of the actuator.
TMUHYDJ02-T09 LEVEL 3
UF94200
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDJ02-P09 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
RESERVOIR
IDENTIFICATION
FIN: 2000GQ
LOCATION
ZONE: 197
TMUHYDJ02-T10 LEVEL 3
UF94200
DESCRIPTION
The inside of the reservoir includes baffles which
give a supply of fluid under negative "g" conditions.
The baffles also form an anti-emulsion device which
limits the emulsion when there is a large return flow.
EFFECTIVITY
EFFECTIVITY
ALL
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TMUHYDJ02-P10 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS - RESERVOIR
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
AIR PRESSURE GAGE
AIR PRESSURE SWITCH
IDENTIFICATION
FIN: 2383GM
IDENTIFICATION
FIN: 2384GH
LOCATION
ZONE: 197
LOCATION
ZONE: 197
DESCRIPTION
The reservoir pressure gage displays the air pressure
in a range of 0-75 psi (0-5.15 bar).
DESCRIPTION
The air pressure switch closes when the pressure
decreases to 22 psi (1.5 bar).The contact opens when
the pressure increases to 25 psi (1.7 bar).
AIR RELIEF VALVE
IDENTIFICATION
FIN: 2005GM
LOCATION
ZONE: 197
TMUHYDJ02-T11 LEVEL 3
UF94200
DESCRIPTION
The air relief valve relieves pressure to the
atmosphere in the event of a system overpressurization
(77 psi - 5.3 bar).
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
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TMUHYDJ02-P11 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS - RESERVOIR COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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29 HYDRAULIC POWER
LOW LEVEL SWITCH
LEVEL TRANSMITTER
IDENTIFICATION
FIN: 2062GQ
IDENTIFICATION
FIN: 2001GQ
LOCATION
ZONE: 197
LOCATION
ZONE: 197
DESCRIPTION
The low level switch is a float operated switch which
includes a relay and a magnet which keeps the contacts
open when the float is high. A metal shroud around the
float operates as a dampener.
DESCRIPTION
It gives a visual indication and sends a signal to the
SDAC and to the reservoir quantity indicator on the
green ground service panel for fluid content
indication.
TMUHYDJ02-T12 LEVEL 3
UF94200
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDJ02-P12 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS - RESERVOIR COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
Page143
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29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
RETURN MANIFOLD
TEMPERATURE TRANSMITTER
FILTER
IDENTIFICATION
FIN: 2381GR
IDENTIFICATION
FIN: 2002GM
LOCATION
ZONE: 197
DESCRIPTION
The temperature transmitter connected to the SDAC
comprises:
- a temperature switch which operates at 95 ± 2°C
(203 ± 4°F)
- two temperature transmitters which measure
fluid temperature between - 55°C (+131°F)
and 120°C (248°F).
TMUHYDJ02-T13 LEVEL 3
UF94200
DESCRIPTION
The LP return filter has a filtration rating of 3 microns.
The bypass device allows fluid to go from the inlet
to the outlet without filtration.
LOCATION
ZONE: 197
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDJ02-P13 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
Page145
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29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
GROUND SERVICE PANEL
RESERVOIR DRAIN VALVE
RESERVOIR DEPRESSURIZATION VALVE
IDENTIFICATION
FIN: 2264GM
IDENTIFICATION
FIN: 2087GM
LOCATION
ZONE: 197
DESCRIPTION
The reservoir depressurization valve is a manually
operated 2-way valve. It is closed by spring force.
It opens by turning the cap assembly or by
connecting the ground depressurization coupling.
LOCATION
ZONE: 197
DESCRIPTION
A hollow type drain valve is installed on the service
panel.
The
valve
is
opened
by
turning
(counter-clockwise) and pushing the bushing/valve pin
assembly.Then, the bushing is rotated clockwise to
lock the valve in the open position.
GROUND CONNECTORS
IDENTIFICATION
FIN: 2006GM, 2008GM
DESCRIPTION
The delivery ground connector (2008 GM) and suction
ground connector (2006 GM) are of the self-sealing
type.
TMUHYDJ02-T14 LEVEL 3
UF94200
LOCATION
ZONE: 197
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDJ02-P14 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
Page147
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
RAT GROUND CONTROL PANEL
IDENTIFICATION
FIN: 3GE
LOCATION
ZONE: 197
TMUHYDJ02-T15 LEVEL 3
UF94200
DESCRIPTION
The RAT ground control panel comprises the controls
to stow the RAT. The GROUND CHECK connector is the
connector for the RAT ground test equipment. The
guarded ARM switch supplies electrical power to the
STOW/RESET selector switch.
Indication lights are checked by using the LAMP test
pushbutton. The indication lights come on during the
RAT retraction.
The RAT control panel is protected by means of a cover
provided with a window so that the indication lights
can be seen with the cover in the closed position.
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
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TMUHYDJ02-P15 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
BLUE SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
Page149
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
TMUHYDJ02 LEVEL 3
UF94200
THIS PAGE INTENTIONALLY LEFT BLANK
EFFECTIVITY
EFFECTIVITY
ALL
29-12-00
Page
Page150
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
29 - HYDRAULIC POWER
29-13-00 YELLOW SYSTEM COMPONENTS
TMUHYDK03 LEVEL 3
UF94200
CONTENTS:
Leakage Measurement Manifold
High Pressure Manifold
Electric Pump Protection
Electric Pump
Engine Driven Pump 2
EDP 2 Case Drain Filter
EDP 2 Pressure Switch
Engine Fire Valve
Reservoir
Return Manifold
Ground Service Panel
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
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151
Page
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS
SAFETY PRECAUTIONS
LEAKAGE MEASUREMENT MANIFOLD
WARNING: When using the manual depressurization valve
put on hand and eye protection and keep away
from the outlet of the valve. The air can be
hot and contain particles of dust and/or
hydraulic fluid.
IDENTIFICATION
FIN : 3146 GM
LOCATION
ZONE : 196
TMUHYDK03-T01 LEVEL 3
UF94200
DESCRIPTION
The ground leakage measurement manifolds of the three
hydraulic systems are identical.The manifold has two
pairs of inlet ports, identified as A and B. As only
one pair is used, the other one is sealed.The three
outlet ports are identified as C, D and E.The 2-way
spool valves are manually opened for ground maintenance
tasks only.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
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Page
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TMUHYDK03-P01 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - LEAKAGE MEASUREMENT MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
153
Page
3
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
HIGH PRESSURE MANIFOLD
FILTER
IDENTIFICATION
FIN: 3011GM
IDENTIFICATION
FIN: 3048GM
LOCATION
ZONE: 196
LOCATION
ZONE: 196
DESCRIPTION
The HP manifold has ports which connect it to the other
parts:
- a system pressure inlet from pumps and ground
supply
- Two outlets to the Leak Measurement System
Manifold
- One outlet and one inlet to the PTU manifold
- One connection to the accumulator/cargo doors
selector valve/brake manifold
DESCRIPTION
The filter element is of the replaceable type. It
cannot be cleaned.
The filter also includes a clogging indicator which
has to be reset manually after replacement of the
filter element.
An anti-spill device is also included in the filter
in order to prevent any hydraulic fluid flow when the
filter element and the bowl are removed.
The HP filter has a filtration rating of 15 microns.
TMUHYDK03-T02 LEVEL 3
UF94200
YELLOW SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
154
Page
4
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TMUHYDK03-P02 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - HP MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
155
Page
5
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_
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29 HYDRAULIC POWER
PRESSURE TRANSDUCER
FLUID SAMPLING VALVE
IDENTIFICATION
FIN: 3065GN
IDENTIFICATION
FIN: 3187GM
LOCATION
ZONE: 196
LOCATION
ZONE: 196
DESCRIPTION
The pressure transducer measures the system pressure
and sends signals to the SDAC for ECAM display and to
ELAC 1/2 for Flight Control System.
DESCRIPTION
The sampling valve makes it possible to take samples
of fluid for analysis with the system at full pressure.
The end cap provided with a slot is used as a tool to
open the valve.
TMUHYDK03-T03 LEVEL 3
UF94200
YELLOW SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
156
Page
6
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TMUHYDK03-P03 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - HP MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
157
Page
7
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29 HYDRAULIC POWER
PRESSURE RELIEF VALVE
LEAKAGE SOLENOID VALVE
IDENTIFICATION
FIN: 3063GM
IDENTIFICATION
FIN: 3150GP
LOCATION
ZONE: 196
LOCATION
ZONE: 196
DESCRIPTION
The pressure relief valve protects the system from
overpressure.It opens at 237 bar (3436 psi) and closes
at 220 bar (3190 psi).
DESCRIPTION
The leakage solenoid valve controls the fluid flow to
the leakage measurement system manifold.It is normally
open. During cargo doors operation the valve is closed
to avoid hydraulic pressure to the flight controls
users.
TMUHYDK03-T04 LEVEL 3
UF94200
YELLOW SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
158
Page
8
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TMUHYDK03-P04 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - HP MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
159
Page
9
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_
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29 HYDRAULIC POWER
PRESSURE SWITCHES
ACCUMULATOR
IDENTIFICATION
FIN: 3151GN, 10CE-3
IDENTIFICATION
FIN: 3070GM
LOCATION
ZONE: 196
LOCATION
ZONE: 196
DESCRIPTION
The two pressure switches monitor the system pressure,
and send a signal at both low and high pressure.
The pressure switch 3151GN sends information to the
FWC, the flight control system and the auto flight
system.
The pressure switch 10CE-3 sends information to the
flight control system only.
DESCRIPTION
The accumulator is of the cylindrical type with an
internal bladder. The metal body has an outer layer
of kevlar to make it stronger. The accumulator is
precharged with nitrogen to 130bar (1885psi) at 20oC.
It holds 1liter (0,26 US gal) of usable fluid when it
is full. The bladder is made of rubber and isolates
the nitrogen gas from the hydraulic fluid. A nitrogen
charging valve (shrader type) and a direct reading
pressure gage are installed on the accumulator.
TMUHYDK03-T05 LEVEL 3
UF94200
YELLOW SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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TMUHYDK03-P05 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - HP MANIFOLD
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page161
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29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS
ELECTRIC PUMP PROTECTION
IDENTIFICATION
FIN: 3807GX, 3808GX
LOCATION
ZONE: 126
TMUHYDK03-T06 LEVEL 3
UF94200
DESCRIPTION
A Current Transformer and a Phase Unbalance Detector
give protection if there is a fault in the electric
pump motor or in the supply.The Current Transformer
compares the flow of current in each phase of the AC
motor supply. If a difference is detected the Current
Transformer sends a signal to the phase unbalance
detector which stops the supply of electrical power
to the electric pump. A test pushbutton is provided
on the Phase Unbalance Detector to simulate a
malfunction. An indicator light comes on to show that
both units have operated correctly.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page162
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TMUHYDK03-P06 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - ELECTRIC PUMP PROTECTION
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page163
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29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS
ELECTRIC PUMP
IDENTIFICATION
FIN: 3075GX
LOCATION
ZONE: 196
TMUHYDK03-T07 LEVEL 3
UF94200
DESCRIPTION
The electric pump assembly includes an electrical motor
(115 VAC - 400 Hz - 3 phases), a pump inlet impeller
a piston type hydraulic pump and a blower.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page164
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TMUHYDK03-P07 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - ELECTRIC PUMP
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page165
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS
ENGINE DRIVEN PUMP 2
IDENTIFICATION
FIN: 3030GD
LOCATION
ZONE: 445
TMUHYDK03-T08 LEVEL 3
UF94200
DESCRIPTION
The Engine Driven Pump (EDP), which is of the variable
displacement type, is attached to the accessory gearbox
on the bottom of the engine via keyhole slots and
installation bolts. The suction line has a quick
disconnect self-sealing coupling to facilitate pump
removal/installation.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page166
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TMUHYDK03-P08 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - ENGINE DRIVEN PUMP
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page167
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29 HYDRAULIC POWER
YELLOW HYDRAULIC COMPONENTS
EDP 2 CASE DRAIN FILTER
IDENTIFICATION
FIN: 3084GM
LOCATION
ZONE: 445
TMUHYDK03-T09 LEVEL 3
UF94200
DESCRIPTION
The filter is equipped with a pop-out clogging
indicator. It operates when the differential pressure
across the filter is 87 ± 8.7 psi (6± 0.6 bar).There
is no bypass device if the filter element is clogged.
The filtration rating is 15 microns.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page168
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TMUHYDK03-P09 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - EDP 2 CASE DRAIN FILTER
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page169
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29 HYDRAULIC POWER
EDP 2 PRESSURE SWITCH
ENGINE FIRE VALVE
IDENTIFICATION
FIN: 3074GD
IDENTIFICATION
FIN: 3046GD
LOCATION
ZONE: 445
LOCATION
ZONE: 674
DESCRIPTION
The switch monitors the output pressure of the
engine driven pump.It sends a low pressure signal
at 1740 ± 72.5 psi (120 ± 5 bar pressure decreasing)
and stops the signal before the pressure reaches
2200 psi (152 bar pressure increasing).
DESCRIPTION
The fire valve, which is of the ball valve type is
installed in the RH wing between the rear spar and the
false rear spar inboard of the pylon. The electric
motor is a 28 VDC type motor.An indicator, visible
through a window provided in the valve housing, shows
the valve position (open or shut).
TMUHYDK03-T10 LEVEL 3
UF94200
YELLOW SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page170
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_
TMUHYDK03-P10 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - EDP 2 PRESSURE SWITCH AND FIRE VALVE
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page171
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MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS
RESERVOIR
IDENTIFICATION
FIN: 3000GQ
LOCATION
ZONE: 196
TMUHYDK03-T11 LEVEL 3
UF94200
DESCRIPTION
The reservoir is made of two moulded light alloy
sections welded together. The top of the reservoir has
a manifold for the components of the air pressurization
system. The reservoir is divided into two parts. The
lower part is always full. A transfer tube enables
hydraulic fluid exchange with the upper part which
constitutes the fluid reserve.
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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TMUHYDK03-P11 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - RESERVOIR
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page173
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29 HYDRAULIC POWER
DRAIN VALVE
LOW LEVEL SWITCH
IDENTIFICATION
FIN: 3264GM
IDENTIFICATION
FIN: 3062GQ
LOCATION
ZONE: 196
LOCATION
ZONE: 196
DESCRIPTION
A hollow type drain valve is installed at the bottom
of the reservoir. The valve is opened by turning
(counter-clockwise) and pushing the bushing/valve pin
assembly. Then the bushing is rotated clockwise to
lock the valve in the open position.
DESCRIPTION
The low level switch is a float operated switch which
includes a relay and a magnet which keeps the contacts
open when the float is high. A metal shroud around the
float operates as a damper for small changes in the
fluid level.
TMUHYDK03-T12 LEVEL 3
UF94200
YELLOW SYSTEM COMPONENTS
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page174
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TMUHYDK03-P12 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - RESERVOIR
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
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29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS
AIR PRESSURE GAGE
AIR RELIEF VALVE
IDENTIFICATION
FIN: 3383GM
IDENTIFICATION
FIN: 3005GM
LOCATION
ZONE: 196
LOCATION
ZONE: 196
DESCRIPTION
The reservoir pressure gage displays the air pressure
in a range of 0-75 psi (0-5 bar).
DESCRIPTION
The air relief valve relieves pressure to the
atmosphere in the event of a system overpressurization
(77 psi/5.3 bar).
AIR PRESSURE SWITCH
IDENTIFICATION
FIN: 3384GM
LOCATION
ZONE: 196
TMUHYDK03-T13 LEVEL 3
UF94200
DESCRIPTION
The air pressure switch closes when the pressure
decreases to 22 ± 1.5 psi (1.5 ± 0.1 bar).The contacts
open when the pressure increases to 25 psi (1.7 bar).
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page176
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TMUHYDK03-P13 LEVEL 3
UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - RESERVOIR
EFFECTIVITY
EFFECTIVITY
ALL
29-13-00
Page
Page177
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29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS
LEVEL TRANSMITTER
IDENTIFICATION
FIN: 3001GQ
LOCATION
ZONE: 196
TMUHYDK03-T14 LEVEL 3
UF94200
DESCRIPTION
The level transmitter permits:
- Direct reading of the hydraulic fluid level.
- Transmission of the level indication to the
cockpit.
It includes an arm fitted with a float which drives a
gear train on a magnetic coupling. The synchro
transmitter shaft supports a pointer to permit direct
reading of the fluid level.
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29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - RESERVOIR LEVEL TRANSMITTER
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YELLOW SYSTEM COMPONENTS
RETURN MANIFOLD
TEMPERATURE TRANSMITTER
The LP return manifold is the connection point for
return lines from different parts of the LP system.
The LP filter and a temperature transmitter are
directly connected to the manifold.
IDENTIFICATION
FIN: 3381GR
LOCATION
ZONE: 196
LP RETURN FILTER
IDENTIFICATION
FIN: 3002GM
LOCATION
ZONE: 196
TMUHYDK03-T15 LEVEL 3
UF94200
DESCRIPTION
The LP RETURN filter has a filtration rating of 3
microns. The bypass device allows fluid to go from the
inlet to the outlet without filtration.
DESCRIPTION
The temperature transmitter connected to the SDAC
comprises:
- a temperature switch which operates at 95 ± 2.2°C
(203 ± 4°F).
- two temperature transmitters which measure
fluid temperature between -55°C (+131°F)
and 120°C (248°F).
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29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - RETURN MANIFOLD
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YELLOW SYSTEM COMPONENTS
GROUND SERVICE PANEL
GROUND CONNECTORS
RESERVOIR DEPRESSURIZATION VALVE
IDENTIFICATION
FIN: 3008GM, 3006GM
IDENTIFICATION
FIN: 3087GM
LOCATION
ZONE: 198
DESCRIPTION
The reservoir depressurization valve is a manually
operated 2-way valve. It is normally closed by spring
force. It opens by turning the cap assembly or by
connecting the ground depressurization coupling.
LOCATION
ZONE: 198
DESCRIPTION
The delivery ground connector (3008GM) and suction
ground connector (3006GM) are of the self-sealing type.
CARGO DOOR HAND PUMP
IDENTIFICATION
FIN: 3009GM
CARGO DOOR SELECTOR VALVE
IDENTIFICATION
FIN: 2500MJ
DESCRIPTION
The hand pump is a two stage type pump and supplies
10 ml per stroke at a high pressure or 40 ml per stroke
at a low pressure.
NOTE: The same hand pump lever (3270GM) is used for
yellow and green hand pump operation.
TMUHYDK03-T16 LEVEL 3
UF94200
LOCATION
ZONE: 198
LOCATION
ZONE: 198
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UF94200
MECHANICS / ELECTRICS & AVIONICS COURSE
29 HYDRAULIC POWER
YELLOW SYSTEM COMPONENTS - GROUND SERVICE PANEL
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TMUHYDK03 LEVEL 3
UF94200
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29 - HYDRAULIC POWER
29-14-00 HYDRAULIC RESERVOIR PRESSURIZING
SYSTEM COMPONENTS
TMUHYDZ03 LEVEL 3
UF94200
CONTENTS:
Reservoir Pressurization Unit
Restrictor
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RESERVOIR PRESSURIZATION UNIT
IDENTIFICATION
FIN: 1360GM
LOCATION
ZONE: 195
TMUHYDZ03-T01 LEVEL 3
UF94200
DESCRIPTION
The reservoir pressurization unit (R.P.U.) has three
inlet ports, one for each supply source (HP air, LP
air and ground connection).
Outlet of the airflow is through a water separator
which is fitted on the R.P.U. Also, a pressure reducing
valve is fitted on the R.P.U.
Two filters are installed in the reservoir
pressurization unit. One is located in the filter bowl
and the other one located in the water separator.
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HYDRAULIC RESERVOIR PRESSURIZING SYSTEM COMPONENTS
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HYDRAULIC RESERVOIR PRESSURIZING SYSTEM COMPONENTS
RESERVOIR PRESSURIZATION UNIT (CONTINUED)
FILTER
The filter, located in the filter bowl, is a
non-cleanable filter element. It cleans the inlet air
and has an indicator installed in front of the R.P.U.
to show when the filter is clogged.
WATER SEPARATOR
The water separator receives supply air from the R.P.U.
and then moves the air through the element. The element
is a cleanable element which separates the water from
the air. An automatic drain valve and a manual
self-sealing drain valve are installed in order to
drain the water to avoid freezing of the water.
TMUHYDZ03-T02 LEVEL 3
UF94200
PRESSURE REDUCING VALVE
A pressure reducing valve is fitted to the R.P.U. In
normal operation, the delivery pressure of engine 1
has priority over the pressure supply from the
pneumatic manifold.
Pressure reducing valve outlet pressure : 50psi(3,5
bar).
RESERVOIR PRESSURIZATION GROUND CONNECTOR
The connector is plunger-type valve. It is manually
opened or closed by rotating the nut which moves the
plunger.
The cap prevents external contamination.
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HYDRAULIC RESERVOIR PRESSURIZING SYSTEM COMPONENTS
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HYDRAULIC RESERVOIR PRESSURIZING SYSTEM COMPONENTS
RESTRICTOR
IDENTIFICATION
FIN: 1392GM
LOCATION
ZONE: 476
TMUHYDZ03-T03 LEVEL 3
UF94200
DESCRIPTION
The restrictor valve is installed in the HP air supply
line from the left engine.
It has a calibrated orifice which restricts the
airflow.
A filter element prevents contamination of the valve.
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29 HYDRAULIC POWER
HYDRAULIC RESERVOIR PRESSURIZING SYSTEM COMPONENTS - RESTRICTOR
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TMUHYDZ03 LEVEL 3
UF94200
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29 - HYDRAULIC POWER
29-23-00 POWER TRANSFER UNIT COMPONENTS
TMUHYDG03 LEVEL 3
UF94200
CONTENTS:
Power Transfer Unit (PTU)
Yellow PTU Manifold
Green PTU Manifold
Isolation Coupling
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TMUHYDG03-T01 LEVEL 3
UF94200
POWER TRANSFER UNIT COMPONENTS
POWER TRANSFER UNIT (PTU)
SOLENOID VALVE
IDENTIFICATION
FIN: 1088GM
IDENTIFICATION
FIN: 3112GL
LOCATION
ZONE: 148
LOCATION
ZONE: 147
COMPONENT DESCRIPTION
There are three hydraulic connections on both sides
of the PTU:
- High Pressure
- Low Pressure
- Case drain
The high pressure and case drain connections on the
PTU are of the standard type union. Only the low
pressure connections are self-sealing quick release
couplings.
COMPONENT DESCRIPTION
It is installed in the PTU supply line, this solenoid
valve operates at the same time with the other solenoid
valve (1012GL) installed on the green PTU manifold.
When the solenoid is energized the valve closes.
When the solenoid valve is de-energized, the spool
moves to open the valve.
PRIORITY VALVE
YELLOW PTU MANIFOLD
IDENTIFICATION
FIN: 3064GM
IDENTIFICATION
FIN: 3113GM
LOCATION
ZONE: 147
LOCATION
ZONE: 148
COMPONENT DESCRIPTION
The yellow priority valve is installed on the PTU
manifold.
It is used to isolate the secondary flight controls
from pressure supply in case of low hydraulic pressure.
COMPONENT DESCRIPTION
The yellow high pressure manifold is connected to the
PTU through the yellow PTU manifold. The yellow PTU
manifold also has a connection to the flap system.
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29 HYDRAULIC POWER
POWER TRANSFER UNIT COMPONENTS - PTU - YELLOW PTU MANIFOLD
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POWER TRANSFER UNIT COMPONENTS
GREEN PTU MANIFOLD
PRIORITY VALVE
IDENTIFICATION
FIN: 1113GM
IDENTIFICATION
FIN: 1064GM
LOCATION
ZONE: 146
LOCATION
ZONE: 146
COMPONENT DESCRIPTION
The green high pressure manifold is connected to the
PTU through the green PTU manifold.
COMPONENT DESCRIPTION
The green priority valve is installed on the PTU
manifold.
It is used to isolate the secondary flight controls
from pressure supply in case of low hydraulic pressure.
SOLENOID VALVE
IDENTIFICATION
FIN: 1112GL
LOCATION
ZONE: 146
IDENTIFICATION
FIN: 23GG
LOCATION
ZONE: 146
COMPONENT DESCRIPTION
It allows the normal braking system to be pressurized.
It is fitted to the Green PTU manifold.
TMUHYDG03-T02 LEVEL 3
UF94200
COMPONENT DESCRIPTION
It is installed in the PTU supply line.
When the solenoid is energized the valve closes.
When the solenoid valve is de-energized, the spool
moves to open the valve.
BRAKE SELECTOR VALVE
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29 HYDRAULIC POWER
POWER TRANSFER UNIT COMPONENTS - GREEN PTU MANIFOLD
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POWER TRANSFER UNIT COMPONENTS
ISOLATION COUPLING
IDENTIFICATION
FIN: 3701GM
LOCATION
ZONE: 148
TMUHYDG03-T03 LEVEL 3
UF94200
COMPONENT DESCRIPTION
It is the only way to isolate the PTU for maintenance
operations. There is no transfer of power between the
two systems (green and yellow) when the isolation
coupling is disconnected.
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29 HYDRAULIC POWER
POWER TRANSFER UNIT COMPONENTS - ISOLATION COUPLING
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TMUHYDG03 LEVEL 3
UF94200
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29 - HYDRAULIC SYSTEM
29-14-00 RESERVOIR PRESSURIZATION
TMUHYDO01 LEVEL 3
UF94200
CONTENTS:
Depressurization Operation
Pressurization Operation
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RESERVOIR PRESSURIZATION
DEPRESSURIZATION OPERATION
Each hydraulic
independently.
reservoir
can
be
depressurized
Open the ground service panel access door.
In the cockpit, open, safety and tag the circuit
breakers.
To depressurize the hydraulic
equipment may be used.
reservoir,
ground
If it is not, on the ground service panel, turn the
assembly of the reservoir depressurization valve
clockwise through 90 degrees.
WARNING
Pay attention, protect your hands and face from the
air which comes out when you open reservoir manual
depressurization valves.
TMUHYDO01-T01 LEVEL 3
UF94200
The air may be hot and contain hydraulic fluid.
Reservoir air pressure can be monitored on the
reservoir pressure gauge.
Keep the depressurization valve open if it is necessary
to depressurize a reservoir during a maintenance
operation. This prevents accidental pressurization of
a completed.
Close the depressurization valve when the maintenance
operation is completed.
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RESERVOIR PRESSURIZATION
PRESSURIZATION OPERATION
To pressurize the reservoir, make
depressurization valve is closed.
sure
that
the
Note that the three hydraulic reservoirs are
pressurized through the air pressure manifold, thus
they are pressurized at the same time.
Open the blue hydraulic compartment door to gain access
to the air pressure manifold.
Remove the cap from the ground connector.
Connect the pressurizing tool to the ground connector.
Turn the nut to open the ground connector valve.
Fill the reservoir with air until 50 psi is shown on
the reservoir pressure gauge.
Turn the nut to close the ground connector valve.
Remove the pressurizing tool.
TMUHYDO01-T01 LEVEL 3
UF94200
Install the cap on the ground connector.
Close the circuit breakers.
Make sure that the work area is clean and clear of
tools and other items and all access panels are closed.
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TMUHYDO01 LEVEL 3
UF94200
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29 - HYDRAULIC POWER
29-16-00 RESERVOIR FILLING
TMUHYDP01 LEVEL 3
UF94200
CONTENTS:
Precautions
Installation
Procedure
Close-Up
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RESERVOIR FILLING
PRECAUTIONS
WARNING: If you get the fluid on your skin or in in
your eyes:
- Flush it away with clean water.
- Get medical aid.
TMUHYDP01-T01 LEVEL 3
UF94200
WARNING: Make sure that the travel ranges of the flight
control surfaces are clear before operating
a hydraulic system.
WARNING: Follow the hydraulic safety procedures.
Precautions have to be taken before starting hydraulic
reservoir filling operation.
Make sure that:
- the speed brakes and spoilers are retracted.
- the thrust reversers are stowed (CFM 56 Engines
only).
- the landing gear is extended and doors are
closed.
- the forward and aft cargo compartment doors
are closed.
All the other hydraulic users must be in a normal
position.
The green hydraulic system must be depressurized. But
do not depressurize the system reservoirs.
The Main Landing Gear door are opened.
Put warning notices in position to prevent
pressurization of the hydraulic systems.
If electrical power is available, on the ECAM check
that the green system pressure shows zero.
If not, operate the rudder to reduce the pressure to
zero.
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Safety and tag the appropriate circuit breakers.
In the main landing gear bay, check that the green
reservoir pressure and the green accumulator pressure
are normal.
INSTALLATION
On the ground service panel of the yellow system the
hand pump handle has to be removed.
On the other side of the aircraft open the green ground
service panel.
Notice that it is possible to fill any of the 3
hydraulic reservoirs from the green service panel.
It is also possible to fill the reservoirs with a
hydraulic service cart.
The hand pump handle is connected to the pump shaft,
and the filling hose stowed above the hydraulic panel
is connected to the fill valve. The other end of the
filling hose is put in the hydraulic fluid container.
PROCEDURE
Turn the selector to the green system position.
Make sure that on the quantity indicator the green
light comes on.
Operate the pump.
Monitor the increase of the fluid level on the quantity
indicator.
If there is no electrical power available, the fluid
level can be checked on the reservoir itself.
Stop the flow when the pointer is at the end of the
green line.
Turn the selector back to the NEUTRAL position.
On the quantity indicator, the green light goes off.
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RESERVOIR FILLING
If a reservoir is overfilled, it cannot be correctly
pressurized.
In this case it must be drained.
CLOSE-UP
TMUHYDP01-T01 LEVEL 3
UF94200
Remove the filling hose and re-install the blanking
caps.
Put the filling hose back in its stowed position.
Remove the handle from the hand pump and put it in its
stowed position at the yellow service panel.
Close the ground service panels.
Close the circuit breakers, close the landing gear
doors.
Make sure that the work area is clean and clear of
tools and other items and access panels are closed.
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TMUHYDP01 LEVEL 3
UF94200
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29 - HYDRAULIC POWER
29-22-00 RAT STOWAGE AND SERVICING
TMUHYAE04 LEVEL 2
UF94200
CONTENTS:
Safety Precautions
Extension Procedure
Retraction Procedure
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RAT STOWAGE AND SERVICING
SAFETY PRECAUTIONS
EXTENSION PROCEDURE
WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES
IN POSITION BEFORE YOU START A TASK ON OR
NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE
The aircraft being electrically supplied, the RAT can
be extended either by pressing in the RAT MAN ON
pushbutton on the hydraulic panel or by pressing in
the MAN ON/AUTO switch on the ELEC EMER PWR panel.
Note: a second person must examine the extension of
the RAT.
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT
CONTROL SURFACES ARE CLEAR BEFORE YOU
PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
WARNING: MAKE SURE THAT THE SAFETY-LOCKS
POSITION ON THE LANDING GEAR.
ARE
IN
WARNING: MAKE SURE THAT THE RAT TRAVEL RANGE IS CLEAR
BEFORE YOU EXTEND THE RAT.
TMUHYAE04-T01 LEVEL 2
UF94200
WARNING: PLACE SAFETY BARRIERS IN POSITION AND FIT THE
RAT PROTECTIVE EQUIPMENT AS PER AMM
PROCEDURE.
WARNING: DO NOT STAND IN FRONT OF OR BESIDE THE RAT
PROPELLER ASSEMBLY DURING THE FUNCTIONAL
TEST.
Note: Do not operate the RAT deployment solenoids for
more than 60 sec. You can operate them more than
once, but you must then let them cool down for
30 min.
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RAT STOWAGE AND SERVICING - EXTENSION PROCEDURE
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RAT STOWAGE AND SERVICING
RETRACTION PROCEDURE
TMUHYAE04-T02 LEVEL 2
UF94200
- Energize the aircraft electrical circuits.
- Pressurize the Blue hydraulic system.
- Make sure that the circuit breaker 49VU
HYDRAULIC/RAT/CTL is closed.
- Remove the protective cover from the turbine blades.
- Turn the turbine blade with your hands until the
arrows on the turbine hub and the gearbox are aligned.
- Set the Arm switch to ON on the RAT ground control
panel.
- Move the STOW/RESET switch to the STOW position and
hold it until the green RAT stowed indicator light
comes on .
- During RAT retraction the red pressure light comes
on.
- When the RAT is retracted and locked, the green light
comes on.
- Release the STOW/RESET switch, the red pressure light
goes OFF.
- Set the ARM switch to OFF, the green RAT stowed light
goes OFF.
- If the aircraft stays on the ground for maintenance,
install the RAT safety device.
Note: if the interlock mechanism is triggered or if
the stow switch is released before the RAT is
fully retracted, the RAT will return to the fully
extended position.
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29 HYDRAULIC POWER
RAT STOWAGE AND SERVICING - RETRACTION PROCEDURE
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29 - HYDRAULIC POWER
29-22-00 RAT TEST
TMUHYDU03 LEVEL 3
UF94200
CONTENTS:
Precautions
Ground Checkout Unit Presentation
Rat Ground Test Motor Presentation
Flow Control Test Kit Presentation
Test Operation (Main Steps)
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RAT TEST
PRECAUTIONS
GROUND CHECKOUT UNIT PRESENTATION
WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES
IN POSITION BEFORE YOU START A TASK ON OR
NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE
The Ground checkout unit provides a visual indication
of RAT rpm and blue system pressure delivered by the
RAT during a ground check.
A cable provides electrical connection between the RAT
control panel and the connector on the ground check-out
unit.
RAT GROUND TEST MOTOR PRESENTATION
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT
CONTROL SURFACES ARE CLEAR BEFORE YOU
PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
WARNING: MAKE SURE THAT THE SAFETY-LOCKS
POSITION ON THE LANDING GEAR.
ARE
IN
To test the RAT performance on ground, a ground test
motor must be connected to the RAT gearbox.
The RAT ground test motor is driven by a hydraulic
ground cart.
FLOW CONTROL TEST KIT PRESENTATION
WARNING: MAKE SURE THAT THE RAT TRAVEL RANGE IS CLEAR
BEFORE YOU EXTEND THE RAT.
WARNING: PLACE SAFETY BARRIERS IN POSITION AND FIT THE
RAT PROTECTIVE EQUIPMENT AS PER AMM
PROCEDURE.
TMUHYDU03-T01 LEVEL 3
UF94200
WARNING: DO NOT STAND IN FRONT OF OR BESIDE THE RAT
PROPELLER ASSEMBLY DURING THE FUNCTIONAL
TEST.
To simulate aircraft hydraulic consumers during RAT
ground check, a flow control test kit must be connected
to the blue hydraulic service panel.
The flow control test kit provides visual indication
of blue system flow delivered by the RAT by means of
a flow meter.
The flow is controlled by means of a manual adjustable
flow valve.
NOTE: Do not operate the RAT deployment solenoids for
more than 60 sec. You can operate them more than
once, but you must then let them cool down for
30 min.
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29 HYDRAULIC POWER
RAT TEST - GROUND CHECK
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RAT TEST
TEST OPERATION (MAIN STEPS)
TMUHYDU03-T01 LEVEL 3
UF94200
To functionally check the RAT on ground it is necessary
to:
- manually deploy the RAT from the cockpit,
- connect the ground test motor to the RAT
gearbox,
- connect the ground checkout unit to the RAT
control panel,
- connect the RAT flow control test kit to the
blue ground service panel,
- spin up the RAT to 5000 rpm with flow control
test kit set to 0 l/mn.
- set flow to values given in the Aircraft
Maintenance Manual with RAT running.
- read RAT rpm and RAT delivery pressure.
The RAT operates properly either in normal pump mode
and in anti-stall mode if the recorded values are
within the tolerances given in the Aircraft Maintenance
Manual.
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29 - HYDRAULIC SYSTEM
29-00-00 PREVENTING HYDRAULIC LEAKS
TMUGENF01 LEVEL 1
UF94200
CONTENTS:
Preventing Hydraulic Leaks
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PREVENTING HYDRAULIC LEAKS
PREVENTING HYDRAULIC LEAKS
These simple plumbing problems can also be real hard
to fix if you dont know the basic hydraulic plumbing
rules. If you dont work carefully and follow these
rules, your work may be the cause of the next hydraulic
leak that delays or cancels a flight.
Lets look at these basic hydraulic plumbing rules :
Contamination that gets into a system or collects on
sealing surfaces can cause leaks internal and external.
TMUGENF01-T01 LEVEL 1
UF94200
Hydraulic fluid itself is a contaminant. It can eat
paint and decals. When hydraulic fluid is allowed to
penetrate a composite structure, it will attack the
core material and reduce it to mush.
Once a composite assembly has been attacked, its
structural integrity will be lost.
To avoid damage caused by twisting, tearing, and
chipping, always lubricate O-rings, packing seals,
back-up rings, and fitting threads with hydraulic fluid
before assembly.
When assembling hydraulic system fittings, be sure
that seals and back-up rings are properly positioned
before torquing the connection.
When installing an elbow fitting into a component, be
sure that all the threads are completely screwed into
the boss. This is to make sure that the O-ring packing
rides in the undercut, and not on the threads.
To prevent an elbow fitting from turning while its
lock-nut is being torqued, hold it with a second
wrench.
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To make a stress-free installation, be sure that all
elbow-to-pipe connections are correctly aligned before
torquing the B-nuts.
Do not use pointed, sharp-edged, or steel tools to
remove or install O-ring packing, back-up rings, and
seals. Damage may occur.
Never reinstall used O-ring packing or seals. Once
they have been compressed, they will never regain their
original shape again.
Before torquing a B-nut, be sure that the tube fits
squarely into the fitting. Never force or bend a tube
to make it fit. Metal tubes dont stretch. If the piece
seems shorter upon reinstallation or after a component
change, something is wrong. Stop ! Think ! And
investigate the problem before you proceed.
Make sure that tubes are not forced into clamps or
line blocks. A stressed installation will lead to a
cracked tube at the nearest fitting or B-nut. And, you
can bet it wont be long before it happens.
If clamps or line blocks are removed so a tube or
component can be replaced, be sure that they are
reinstalled again. Tubes that are not properly
supported will vibrate. Vibration is the greatest enemy
of a hydraulic system.
It causes tubes to crack, and connections at fittings
to loosen up and leak.
When repairs are finished, always bleed the system,
and leak check your work.
We, the mechanics, have control of torquing. The lack
of proper torquing is the single greatest cause of
leaks. Those calibrated elbows are notorious for being
out of calibration. Use a torque wrench.
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29 - HYDRAULIC SYSTEM
29-00-00 CFDS SPECIFIC PAGE PRESENTATION
TMUHYDQ02 LEVEL 3
UF94200
CONTENTS:
-General
-Auto Flight System (AFS)
-Flight Controls (F/CTL)
-Instruments (INST)
-Landing Gear (L/G)
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CFDS SPECIFIC PAGE PRESENTATION
GENERAL
The CFDS SYSTEM REPORT/TEST menu does not include the
hydraulic menu page.
The purpose of this module is to present the access
to the LAST LEG REPORT of the Auto Flight, Flight
Controls, Instrument and Landing Gear systems, in case
of failure of certain hydraulic components.
The hydraulic system components monitored by the AFS,
the F/CTL, the INST and the L/G systems are :
- the pressure switches
- the pressure transmitters
- the temperature transmitters
- the quantity indicators.
AUTO FLIGHT SYSTEM (AFS)
TMUHYDQ02-T01 LEVEL 3
UF94200
The green pressure switch 1151GN sends a signal to the
Flight Augmentation Computer 1 (FAC1) and the yellow
pressure switch 3151GN sends a signal to FAC2.
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CFDS SPECIFIC PAGE PRESENTATION (AUTO FLIGHT SYSTEM)
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CFDS SPECIFIC PAGE PRESENTATION
FLIGHT CONTROLS (F/CTL)
TMUHYDQ02-T02 LEVEL 3
UF94200
The blue, yellow and green HP manifold pressure
switches (2151GN-3151GN-1151GN) send a signal to the
Elevator Aileron Computers (ELACs) and to the Spoiler
Elevator Computers (SECs).
The pressure switches (10CE2-10CE3-10CE1) belonging
to the Flight Control System send a signal to ELACs
and SECs.
The blue, yellow and green HP manifold pressure
transmitters (2065GN-3065GN-1065GN) send a signal to
the ELACs.
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29 HYDRAULIC POWER
CFDS SPECIFIC PAGE PRESENTATION (FLIGHT CONTROLS)
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CFDS SPECIFIC PAGE PRESENTATION
INSTRUMENTS (INST)
TMUHYDQ02-T03 LEVEL 3
UF94200
The blue, yellow and green HP manifold pressure
transmitters (2065GN-3065GN-1065GN) send a signal to
the System Data Acquisition Concentrator (SDACs) for
ECAM display.
The blue, yellow and green temperature transmitters
(2381GR-3381GR-1381GR) send a signal to the SDACs for
ECAM display.
The blue, yellow and green hydraulic quantity
indicators (2000GQ-3000GQ-1000GQ) send a signal to the
SDACs for ECAM display.
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CFDS SPECIFIC PAGE PRESENTATION (INSTRUMENTS)
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CFDS SPECIFIC PAGE PRESENTATION
LANDING GEAR (L/G)
TMUHYDQ02-T04 LEVEL 3
UF94200
The green HP manifold pressure switch 1151GN sends a
signal to the Braking and Steering Control Units (BSCU
A and BSCU B).
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29 HYDRAULIC POWER
CFDS SPECIFIC PAGE PRESENTATION (LANDING GEAR)
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TMUHYDQ02 LEVEL 3
UF94200
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