A380 TECHNICAL TRAINING MANUAL RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power This document must be used for training purposes only
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A380 TECHNICAL TRAINING MANUAL
ATA 29 HYDRAULIC POWER
LAY08521 - L1502T0
Hydraulic Power System Presentation (1) . . . . . . . . . . . . . . . . . . . . . . 2
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
TABLE OF CONTENTS
Jan 13, 2009
Page 1
A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Main Characteristics
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The A380 hydraulic power is generated by two fully independent
hydraulic circuits, green and yellow, which are normally pressurized at
5000 PSI. The two circuits operate simultaneously, with no fluid transfer
between them.
As a backup the electrical sources power the local electro-hydraulic
generation:
- The flight controls through the Electro-Hydrostatic Actuators (EHA)
and Electrical Backup Hydraulic Actuators (EBHA),
- The braking and Nose Wheel Steering (NWS) system through Local
Electro-hydraulic Generation Systems (LEHGS).
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Jan 13, 2009
Page 2
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A380 TECHNICAL TRAINING MANUAL
MAIN CHARACTERISTICS
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Jan 13, 2009
Page 3
A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Hydraulic Power System Architecture
The hydraulic power system comprises:
- Main hydraulic power generation,
- Backup hydraulic power generation supplied by electrical power,
- Auxiliary hydraulic power generation.
Main Hydraulic Power Generation
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The green and yellow hydraulic circuits are fully independent. Four
Engine Driven Pumps (EDPs) per circuit pressurize the hydraulic
fluid at 5000 PSI in normal operation.
Each circuit has a single hydraulic reservoir (RSVR).
There are two EDPs per engine, each engine has one Fire Shut Off
Valve (FSOV) to supply hydraulic fluid to both EDPs on that engine.
The green and yellow circuits generate hydraulic power to operate:
- The primary Flight Controls (F/CTL),
- The secondary flight controls,
- The landing gear,
- The braking and steering system.
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Jan 13, 2009
Page 4
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM ARCHITECTURE - MAIN HYDRAULIC POWER GENERATION
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Jan 13, 2009
Page 5
A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Hydraulic Power System Architecture (continued)
Backup Hydraulic Power Generation
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As a back up to the normal hydraulic circuits, hydraulic pressure can
be locally produced for the flight controls and landing gear using local
electro-hydraulic power generators, supplied by the electrical network.
Note that the Ram Air Turbine (RAT) supplies only electrical power.
The local electro-hydraulic generation system comprises:
- EHA (Electro-Hydrostatic Actuator) and EBHA (Electrical Backup
Hydraulic Actuator) to operate primary flight controls,
- 3 LEHGS (Local Electro-Hydraulic Generation System) to operate
braking and steering systems.
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
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Page 6
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM ARCHITECTURE - BACKUP HYDRAULIC POWER GENERATION
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Hydraulic Power System Architecture (continued)
Auxiliary Hydraulic Power Generation
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Two Electric Motor Pumps (EMPs) pressurize each hydraulic circuit,
provided the aircraft is on ground with all engines shut down.
For the cargo doors operation, one of the EMPs in the green system
operates to generate hydraulic power. An isolation valve closes to
isolate the main hydraulic users from the cargo doors hydraulic circuit.
A similar isolation valve is fitted to the yellow circuit for the body
gear steering system, which can be pressurized by the yellow EMPs.
A manually operated backup auxiliary hydraulic pump can be used
to operate the cargo doors.
Ground connections located in the inner pylons can also supply the
green and yellow circuits with hydraulic pressure.
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
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Page 8
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM ARCHITECTURE - AUXILIARY HYDRAULIC POWER GENERATION
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Control And Indicating
Each hydraulic circuit reservoir supplies their respective EDPs through
the FSOV that isolates the engine from the hydraulic circuit in case of
fire.The valves are controlled by fire handles located on the cockpit
overhead engine FIRE panel. Each EDP can be controlled ON or OFF
through its respective P/BSW located on the HYDraulic cockpit control
panel. Both EDPs on each engine can be declutched through a P/BSW
located on the cockpit hydraulic control panel. On ground for maintenance
operation, each EMP can be controlled ON or OFF through its respective
P/BSW located on the GrouND HYDraulic maintenance cockpit panel.
Monitoring
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Two Hydraulic System Monitoring Units (HSMUs), one for each
hydraulic circuit, control and monitor the green and yellow hydraulic
circuits respectively. They also give indication on the Control and
Display System (CDS).
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Jan 13, 2009
Page 10
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A380 TECHNICAL TRAINING MANUAL
CONTROL AND INDICATING - MONITORING
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Hydraulic Power Maintenance Items
When you work on the hydraulic power system, make sure that you obey
all the AMM safety precautions. This will prevent injury to persons and/or
damage to the aircraft.
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Safety Items
Here is an overview of main safety precautions relative to the hydraulic
power system.
As the green and yellow hydraulic systems are similar, the diagrams
refer to only one hydraulic power system, the yellow system.
Pay attention to the status of the hydraulic power system and its users
in case they are pressurized.
Make sure that all the safety devices and all the warning notices are
in position, before any maintenance operations are done.
When disconnecting any Hydraulic line and component, all pumps
must be switched off and the hydraulic reservoir must be depressurized
to prevent fluid loss and personal injury.
When opening the manual depressurization valve of the reservoirs
protect your hands and face from the gas, as there could be a risk of:
- Burns from hot pressurized gas,
- Contamination from hydraulic fluid contained in the gas.
Suitable protective clothing must be worn when working with
hydraulic fluid, such as rubber gloves and safety goggles. Do not get
hydraulic fluid on your skin, in your eyes or in your mouth. Hydraulic
fluid is poisonous and can go through your skin and into your body.
The Local Electro-Hydraulic Generation System (LEHGS) weighs
approximately 120 pounds. If incorrect procedures are used during
removal or installation, injury to persons, or damage to the LEHGS
can occur.
By consequence, the LEHGS removal/installation tasks require specific
tooling that must be used.
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HYDRAULIC POWER SYSTEM PRESENTATION (1)
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER MAINTENANCE ITEMS - SAFETY ITEMS
RAMP & SERVICING COURSE - M02 (RR Trent 900) ATA 29 Hydraulic Power
HYDRAULIC POWER SYSTEM PRESENTATION (1)
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER SYSTEM PRESENTATION (1)
Hydraulic Power Maintenance Items (continued)
Ground Support Equipment
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Some hydraulic power system maintenance tasks require Ground
Support Equipment (GSE).
As an example, during the LEHGS Removal/Installation, a specific
GSE is used to hold this heavy component.
Refer to the Aircraft Maintenance Manual (AMM) for the tasks.
Also, refer to the illustrated Tool and Equipment Manual (TEM) for
the complete list of the tools.
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HYDRAULIC POWER SYSTEM PRESENTATION (1)
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A380 TECHNICAL TRAINING MANUAL
HYDRAULIC POWER MAINTENANCE ITEMS - GROUND SUPPORT EQUIPMENT
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HYDRAULIC POWER SYSTEM PRESENTATION (1)
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REFERENCE LAY08521
JANUARY 2009
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AIRBUS S.A.S. 2009
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