Boeing
737−300/400/500
ATA 38
Water and Waste
EASA Part-66 B1
B737−3 38 B1 E
For training purposes only.
Copyright by Lufthansa Technical Training.
LTT is the owner of all rights to training documents and training
software.
Any use outside the training measures, especially reproduction
and/or copying of training documents and software − also extracts
thereof −in any format all (photocopying, using electronic systems
or with the aid of other methods) is prohibited.
Passing on training material and training software to third parties
for the purpose of reproduction and/or copying is prohibited without
the express written consent of LTT.
Copyright endorsements, trademarks or brands may not be removed.
A tape or video recording of training courses or similar services is
only permissible with the written consent of LTT.
In other respects, legal requirements, especially under copyright
and criminal law, apply.
Lufthansa Technical Training
Dept HAM US
Lufthansa Base Hamburg
Weg beim Jäger 193
22335 Hamburg
Germany
Tel:
+49 (0)40 5070 2520
Fax:
+49 (0)40 5070 4746
E-Mail: Customer-Service@LTT.DLH.DE
www.Lufthansa-Technical-Training.com
B737−300/400/500
38−00
ATA 38
WATER AND WASTE
For Training Purposes Only
Lufthansa Technical Training
WATER AND WASTE
FRA US/T-4 RoU
05.04.2005
Page: 1
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−00
38-00
GENERAL
WATER & WASTE
Purpose
The water system supplies potable water to the galleys and lavatories. The
waste system provides a means of storing wastes in toilet tanks and removing
the wastes during servicing.
For Training Purposes Only
General Components Location
The water and waste facilities includes galleys and lavatories which are located
in the passenger compartment. The water tank is located aft of the aft cargo
compartment. The service panels are located on the exterior skin of the fuselage.
FRA US/E ur
Aug. 1999
Page: 2
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−00
AIR
SOURCE
WATER PRESSURIZATION SYSTEM
WATER
SERVICE
PANEL
PASSENGER WATER SYSTEM
LAVATORY COMPT
LAVATORY
SINK
DRAINS
GALLEY UNIT
LAVATORY
FLOOR
DRAINS
For Training Purposes Only
WASTE WATER SYSTEM
GALLEY
SINK DRAINS
TOILET SYSTEM
TOILET
SERVICE
PANEL
DRAIN
MAST
AIR
FRESH WATER
WASTE
Figure 1
FRA US/E ur
Aug. 1999
Water and Waste System Diagram
Page: 3
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
38−10
POTABLE WATER SYSTEM
WATER SYSTEM LOCATIONS
Purpose
Purpose of the water system is to supply water to the galleys and lavatories for
use by the passengers and crew.
General Subsystem Features
The water system consists of:
− a filling system for the tank through an external service panel,
− a water tank with a quantity indicating system, for storing the water,
− an air pressure system to force the water from the tank,
− and distribution lines to deliver the water to the galleys and lavatories.
For Training Purposes Only
Tank and Distribution
The tank is filled from a ground cart through an external service panel, and
pressurized from the pneumatic manifold. When pressurized, water is forced
from the tank through distribution lines to the galleys and lavatories. In the lavatories, some water is diverted through an electric water heater to the hot water
faucet. The rest of the water goes to the cold water faucet. A filter on the cold
water line is optional.
A tank quantity transmitter signals the quantity to the indicator located in the aft
galley area. An external indicator, on the service panel, is optional.
The tank and distribution lines can be drained through valves located adjacent
to the tank and in the lavatories.
FRA US/E ur
Aug. 1999
Page: 4
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
APU
MANIFOLD
AIR PRESSURE SUPPLY
LINE TO WATER TANK
FWD
LAVATORY
COMPARTMENT
GALLEY NO.1
SUPPLY LINE
POTABLE
WATER
SUPPLY
LINE
GALLEY
For Training Purposes Only
COMPRESSOR
WATER
TANK
Figure 2
FRA US/E ur
Aug. 1999
WATER SERVICE
PANEL
Water System Location
Page: 5
B737-300/400/500
38−10
WATER SERVICE PANEL
Filling the Tank
Water is supplied to the system from a service cart. A water service panel on
the left side of the airplane is used for filling the tank.
The service panel contains a fill connection and an overflow outlet. These units
are connected with tubing to the fill and overflow valve, which has a control rod
and handle that protrudes through the service panel. An air line, connected to
the top of the tank, terminates in the service panel at a valve that may be used
to pressurize the system. The tank drain valve control handle is accessible
from the service panel.
To fill the tank use the following procedure:
Attach the supply hose to the fill connector.
Place the fill and overflow valve control handle in OPEN position.
Turn on the water supply. While water is filling, the tank will vent through the
overflow outlet.
When the tank is full, water is forced out the overflow.
Turn off water supply, disconnect the supply hose.
Place the fill and overflow control handle in CLOSED position. The water
service panel door cannot be closed if the the fill and overflow handle is in
the OPEN position.
For Training Purposes Only
Lufthansa Technical Training
WATER AND WASTE
FRA US/E ur
Aug. 1999
Page: 6
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
FILL AND OVERFLOW VALVE
HANDLE
OVERFLOW FITTING
FILL FITTING
DOOR ACTUATED SWITCH
1
CAP
AIR VALVE
For Training Purposes Only
TANK DRAIN
VALVE HANDLE
DOOR LATCH
MAGNET
1
Not installed on all 737 airplanes
(97173)
Figure 3
FRA US/E ur
Aug. 1999
Water Service Panel
Page: 7
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
For Training Purposes Only
THIS PAGE INTENTIONALLY LEFT BLANK
FRA US/E ur
Aug. 1999
Page: 8
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
PRESSURE
SWITCH
QUANTITY
TRANSMITTER
OVERFLOW
LINE
WATER TANK
AIR
PRESSURE
LINE
FILL
LINE
SUPPLY
LINE
DRAIN
VALVE
SHAFT
FILL AND
OVERFLOW
VALVE
DRAIN
LINE
For Training Purposes Only
DRAIN VALVE
FWD
SERVICE
PANEL
FWD
INBD
Figure 4
FRA US/E ur
Aug. 1999
INBD
Water Tank Components
Page: 9
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
WATER SYSTEM SCHEMATIC
Distribution to Galleys and Lavatories
The water supply line is routed from the tank to the aft passenger cabin ceiling
area. From there, it is routed above the ceiling panels to the forward end of the
passenger cabin through flexible tubing enclosed in an aluminum shroud. The
shroud prevents water from dripping onto the ceiling panel if a leak should occur. The shroud will conduct leaking water to the lower fuselage area where it
can drain out the fuselage drains. Supply lines go from the main distribution
line to the lavatories and the galleys.
Galley supply is through disconnect fittings located in the ceiling above each
galley.
Lavatory supply is routed inside the lavatory walls to the area under the wash
basin counter. It divides to supply:
Cold water faucet
Hot water faucet −water passes through a water heater and then to the hot
water faucet.
NOTE: Cold and hot water can be mixed by a mixing valve and will come to a
single faucet. That is optional (see schematic below).
For Training Purposes Only
A drain valve is installed in the lines under the counter.
Waste water from the wash basin drains either into the toilet tank or overboard
through an optional drain mast.
Monitoring water Quantity in Tank an indicator in the aft galley area provide
means for checking tank quantity.
FRA US/T RoU
March 2002
Page: 10
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
28V DC
BUS 1
115V AC
BUS 1
115V AC
BUS 2
115V AC
BUS 1
FAUCET
SAME AS
FWD
AFT GALLEY
FWD GALLEY
SAMES AS
FWD
R AFT LAV WATER HEATER
P
P18−4 CIRCUIT BREAKER PANEL
L AFT LAV WATER HEATER
PRESSURE
CUTOUT SW
115V AC
BUS 2
MANUAL
RESET
OFF
ON
OVERHEAT SW
HEATER
CONTROL
SWITCH CYCLING SW
NEON LIGHT
FWD LAVATORY WATER HEATER
COMPRESSOR
RELAY
P6−4
DRAIN
VALVE
THERMOSTAT
FORWARD LAVATORY
AIR CMPRSR
SERVICE DOOR
PROX SWITCH
(IF INSTALLED)
RELIEF
VALVE
FULL
PRESS
REGULATOR
For Training Purposes Only
PRESSURIZED
AIR FROM
PNEUMATIC
SYSTEM
OVERFLOW LINE
3/4
1/2
FILL LINE
1/4
POTABLE WATER
TANK
FILL AND
OVER FLOW
TANK
VALVE
DRAIN
VALVE
EMPTY
WATER QUANTITY
INDICATOR
POTABLE WATER
AIR PRESSURE
OVERFLOW
FITTING
AIR VALVE
TANK DRAIN
FILL
VALVE HANDLE
FILL
FITTING
HANDLE
WATER SERVICE STATION
Figure 5
FRA US/T RoU
March 2002
Water System Schematic
Page: 11
B737-300/400/500
38−10
SINK CABINET COMPONENTS
Physical Description/Features
The water supply line enters from the ceiling and is routed to the compartment
under the sink. The supply divides with one line routed to the cold water faucet
and the other line to the water heater and hot water faucet (depend on the configuration).
Each lavatory has a drain valve for draining the lavatory plumbing. The drain
valve has 3 positions:
OFF
DRAIN
ON
In the ON position (normal position), the water is supplied to the faucets.
In the OFF position, all lines are closed.
In the DRAIN position, all lines are open to allow water to drain overboard.
The system is vented through self−venting faucets.
Waste water from the wash basin drains either into the toilet tank or overboard
through a drain mast.
The toilet and lavatory are vented through a muffler.
For Training Purposes Only
Lufthansa Technical Training
WATER AND WASTE
FRA US/E ur
Aug. 1999
Page: 12
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
FAUCET
WATER TEMPERATURE
ADJUSTMENT KNOB
AIR VENT
LINE
COLD WATER
SUPPLY LINE
MIXING VALVE
1
SINK
OVERFLOW LINE
(AFT LAV)
SINK
OVERFLOW LINE
(FORWARD LAV)
WATER
HEATER
For Training Purposes Only
LAVATORY
DRAIN VALVE
MUFFLER
DRAIN LINE
WASTE WATER
DRAIN LINE
FWD
DRAIN MAST
WASTE WATER DRAIN
LINE TO DRAIN MAST
1
OPTIONAL
Figure 6
FRA US/E ur
Aug. 1999
Sink Cabinet Components
Page: 13
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
WATER HEATER
Location
A water heater is installed under each lavatory counter in the supply line to the
hot water faucet.
Access
The heater is accessible through the door under the sink.
Physical Description/Features
The heater capacity is one and one−half quarts. Water is heated by a 400−watt
heater consisting of heater elements in the heater tank. A control switch, an
indicator light and an overheat switch are mounted on the outside wall of the
heater tank. Normally, the control switch should be ON and the light illuminated. A pressure relief valve in the side of the water heater tank relieves at
approximately 140 psi.
Operation
A cycling thermal switch in the heater tank regulates water temperature to 52°C
(125°F). The overheat switch on top of the water heater limits the case temperature to approximately 88°C (190°F). If overheat occurs, the switch interrupts
power to the heater and the light. The light will not illuminate if the control
switch is OFF or the overheat switch is open.
For Training Purposes Only
Maintenance Practices
If an overheat occurs, the switch must be manually reset. Remove the cover at
the top of the water heater and reset by pressing the center of the rubber cover
over the overheat switch. Reset is indicated by illumination of the light.
FRA US/E ur
Aug. 1999
Page: 14
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
CONTROL
SWITCH
WATER HEATER
COVER
28V DC
BUS 1
C138 WATER QTY IND
115V AC
BUS 1
PRESSURE
RELIEF
VALVE
115V AC
BUS 2
115V AC
BUS 1
C105 LAVATORY WATER
HEATER − R AFT
C106 LAVATORY WATER
HEATER − L AFT
C104 LAVATORY WATER
HEATER − FWD
P18-4 CIRCUIT BREAKER PANEL
WATER HEATER
OVERHEAT
SWITCH
INDICATOR
LIGHT
OFF
MANUAL
RESET
PRESS
TO RESET
For Training Purposes Only
OVERHEAT SW
ON
HEATER
CONTROL
SWITCH
115V AC
CYCLING SW
HEATER
CONTROL
SWITCH
NEON LIGHT
M91 FORWARD LAVATORY WATER HEATER (typical)
WATER HEATER (COVER REMOVED)
(221110)
Figure 7
FRA US/E ur
Aug. 1999
Water Heater
Page: 15
Lufthansa Technical Training
For Training Purposes Only
WATER AND WASTE
B737-300/400/500
38−10
WATER TANK DRAIN COMPONENTS
Draining Tank and Distribution System
A two−position drain valve, CLOSED or OPEN, is located below the tank. The
control handle for the valve is in the water service panel. In the OPEN position,
water in the tank and main distribution line will drain through an opening in the
lower fuselage.
The lavatory distribution lines are drained through the three−position Potable
Water Supply & Drain Shutoff Valve in the lavatories. These valves function as
follows:
ON (Supply)
− Normal. Water from the main distribution line passes through to the
heater and the cold water faucet.
DRAIN
− Drains water from the lavatory lines and main distribution line in the
cabin ceiling area overboard
OFF
− Shuts off water supply from the main distribution line to the lavatory.
The lavatory faucets are self−venting.
Secondary Drain Valve (Fwd Lavatory only)
A second valve is added to the drain line installation in the forward lavatory.
If the Potable Water Supply & Drain Shutoff Valve ist accidentlally set to the
drain position, the Secondary Drain Valve will not let the water drain.
It must be placed to the open position for the Water System Draining Procedure.
For Draining Procedure see AMM.
FRA US/T RoU
Mar. 2002
Page: 16
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
WATER
TANK
SUPPLY & DRAIN
SHUTOFF VALVE
For Training Purposes Only
WATER TANK
DRAIN VALVE
SECONDARY
DRAIN VALVE
(FWD LAV ONLY)
FWD
Figure 8
FRA US/T RoU
Mar. 2002
VALVE ACTUATOR
SHAFT HANDLE
(SHOWN IN CLOSED
POSITION)
Water Tank Drain Components
Page: 17
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−10
WATER TANK QUANTITY INDICATION SYSTEM
Location
The tank is installed aft of the aft cargo compartment. A probe−type quantity
transmitter is installed through the top of the tank. An indicator is located in the
aft galley area. An external indicator on the service panel is optional.
Physical Description/Feature
The fiberglass tank, with a total volume of 40 U.S. gallons on 737−400 airplanes, (34 U.S. gallons all except 737−400), is enclosed in an insulating blanket. It is installed with bolts attached at four places.
Access
A door in the end of the tank provides access to the quantity transmitter. Access to the tank is through the aft cargo compartment.
For Training Purposes Only
Power
The quantity transmitter and indicator use 28 volts from dc bus No. 1.
Operation
The indicator has five lights which illuminate to indicate water quantity when a
button on the indicator is pressed.
A float installed around the probe will follow the water level. Inside the float are
three magnets. Inside the probe are reed switches. As the float moves, the
magnets will close the associated reed switch. These reed switches are connected to the indicator lights so that:
An empty tank will turn on the EMPTY light only.
A 1/4 full tank will turn on the EMPTY and 1/4 lights.
A 1/2 full tank will turn on the EMPTY, 1/4, and 1/2 lights.
A 3/4 full tank will turn on the EMPTY, 1/4, 1/2 and 3/4 lights.
A full tank will turn on all lights.
FRA US/E ur
Aug. 1999
Page: 18
B737-300/400/500
38−10
For Training Purposes Only
Lufthansa Technical Training
WATER AND WASTE
Figure 9
FRA US/E ur
Aug. 1999
Water Tank Quantity Indication System
Page: 19
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−40
38−40
WATER PRESSURIZATION SYSTEM
WATER TANK AIR PRESSURIZATION
Purpose
The purpose of the pressurization system is to force the water from the tank
through the distribution lines to the galleys and lavatories.
Location
The pressurization system components are located above the water tank. The
pneumatic connection is opposite the left turbofan valve connection to the APU
duct in the keel beam. The external connection is on the service panel.
For Training Purposes Only
Physical Description/Features
Air passes through the following components before entering the water tank:
A filter
A pressure regulator
A pressure relief valve
Operation
The pneumatic manifold supplies bleed air from engine number one, engine
number two, and the APU.
On some airplanes high stage bleed air from the engine number one is the
primary air supply.
On some airplanes an electrical compressor supplies air pressure when engine bleed or APU bleed air pressure is decreased less than 18 psi.
The air pressure will be routed:
Through a micron filter.
Through a pressure regulator, which reduces pressure to 25 ±2 psig, then to
the tank.
A pressure relief valve prevents overpressurization of the tank. The valve
opens at 50 ±2 psig and will reset at 37 ±2 psig.
Normal water tank and system pressurization is from engine number one or
from the pneumatic manifold. During maintenance, the tank may be pressurized by connecting an air pressure source to the air valve on the water service
panel.
FRA US/T RoU
24.03.2005
Page: 20
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−40
ENGINE BLEED
AIR VALVE
ENGINE NO. 1
BLEED AIR
PNEUMATIC
MANIFOLD
ENGINE NO. 2
BLEED AIR
ENGINE BLEED
AIR VALVE
ISOLATION
VALVE
ENGINE NO. 1 HIGH
STAGE BLEED AIR
1
RESTRICTOR
GROUND
PNEUMATIC
CONNECTOR
AIR FILTER
PRESSURE
REGULATOR
APU BLEED AIR
MANIFOLD
AIR FILTER
For Training Purposes Only
AIR
VALVE
WATER
SERVICE
PANEL
PRESS.
RELIEF
VALVE
WATER
TANK
1
AIR COMPRESSOR
PRESSURE
SWITCH
NOT ON ALL AIRPLANES
Figure 10
FRA US/T RoU
24.03.2005
Water Tank Pressurization System Schematic
Page: 21
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−40
For Training Purposes Only
THIS PAGE INTENTIONALLY LEFT BLANK
FRA US/E ur
Aug. 1999
Page: 22
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−40
115V AC
3
BUS 2
C873
POTABLE WATER
COMPRESSOR
M753 POTABLE WATER
AIR COMPRESSOR
P6−4 AC PWR PANEL
For Training Purposes Only
P
R184 COMPRESSOR
CONTROL
RELAY (J5)
Magnet
1
1
NOT ON ALL AIRPLANES
Figure 11
FRA US/E ur
Aug. 1999
S945 WATER PRESSURE
PROX. SWITCH
S692 WATER PRESSURE
CUT−OUT SWITCH
Water Tank Pressurization Compressor Circuit
Page: 23
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−40
For Training Purposes Only
THIS PAGE INTENTIONALLY LEFT BLANK
FRA US/E ur
Aug. 1999
Page: 24
Lufthansa Technical Training
WATER AND WASTE
B737-300/400/500
38−40
AIR PRESSURE
INLET TO TANK
AND PRESSURE
SWITCH
COMPRESSOR
PNEUMATIC
COMPONENTS
CHECK
VALVE
AIR INTAKE
FILTER
AIR PRESSURE
SUPPLY LINE
For Training Purposes Only
POTABLE WATER
SUPPLY LINE (REF)
WATER
TANK
Figure 12
FRA US/E ur
Aug. 1999
WATER SERVICE
PANEL
Water Tank System Components Location
Page: 25
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
38−30
WASTE DISPOSAL
TOILET COMPARTMENT INTRODUCTION
Purpose
The lavatories provide sanitary facilities for the passengers and crew.
General Component Locations
There are toilet facilities in each lavatory.
For Training Purposes Only
General Subsystem Features
Each toilet consists of a waste tank and flushing equipment. Toilet vents lead to
external vent nozzles. Servicing is accomplished through toilet service panels
FRA US/E ur
Oct. 1999
Page: 26
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
POTABLE WATER
SUPPLY LINE
GALLEY
DRAIN
VENT
FORWARD
LAVATORY
RIGHT DOOR
THRESHOLD
DRAIN
SINK
OVERFLOW
DRAIN MAST
WASTE WATER
DRAIN LINE
For Training Purposes Only
DRAIN VENT
TO LEFT DOOR
THRESHOLD DRAIN
DRAIN FITTING
GALLEY
DRAIN
LINES
DRAIN
VALVE
DRAIN VENT
POTABLE WATER
DRAIN LINE
Figure 13
FRA US/E ur
Oct. 1999
Water Waste Components Location
Page: 27
B737−300/400/500
38−30
THIS PAGE INTENTIONALLY LEFT BLANK
For Training Purposes Only
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
FRA US/E ur
Oct. 1999
Page: 28
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
POTABLE WATER
SUPPLY LINE
AIR VENT
LINE
AFT LEFT
LAVATORY
AFT RIGHT
LAVATORY
SINK OVERFLOW
TOILET VENT
LINE
TO RIGHT DOOR
THRESHOLD DRAIN
MUFFLER
DRAIN VENT
WASTE WATER
DRAIN LINE
For Training Purposes Only
GALLEY DRAIN
DRAIN
MAST
GALLEY
DRAIN
POTABLE WATER
DRAIN LINE
TO LEFT DOOR
THRESHOLD DRAIN
DRAIN VENT
Figure 14 Water Waste Components Location (cont.)
FRA US/E ur
Oct. 1999
Page: 29
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
TOILET SYSTEM
Operation
When the flush control is activated, the motor operates a pump inside the tank
and pumps water into the bowl flush ring. The motor drives a filter drive pinion
shaft which rotates a filter basket. The basket surrounds the pump inlet to prevent objects entering the pump inlet. A fixed wiper blade on the outer surface of
the impeller housing keeps the surface of the basket open. On aircrafts without
drain mast fluid in excess of the 17 U.S. gallon capacity will overflow through
the drain tube into the 15 U.S. gallon auxiliary toilet tank.
Toilet Flushing Circuit
The toilet flush motor is powered by 115 volts ac, 3−phase. The C phase is
used to power the timer and relays.
For Training Purposes Only
Control
When the flushing switch is pushed, a circuit is completed to energize a relay
and provide power to the flush motor for the timed interval. Reversing of the
flush motor is accomplished by a change over relay to reverse phases A and B.
The flush motor runs for 10 seconds during each flush cycle.
FRA US/E ur
Oct. 1999
Page: 30
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
TO OVERBOARD
VENT
CABIN
AIR
FORWARD
TOILET
FLUSH
MOTOR
115V AC
BUS 1
C814
FWD TOILET
FLUSH MOTOR
CHANGE
OVER
CONTROL
10 SEC
TIMER
PUMP
P18−4 CIRCUIT BREAKER
PANEL
FLUSH PORT
FORWARD FLUSH TIMER
FILTER
TANK DRAIN VALVE
DRAIN VALVE
CONTROL
SPRAY NOZZLE
BALL VALVE
FORWARD TOILET TANK
1
For Training Purposes Only
PUSH−TO−OPEN
LEVER
HINGED DRAIN PLUG
(FLAPPER VALVE)
HINGED
DRAIN
CAP
FLUSH PORT
DRAIN VALVE
CONTROL
PUSH−TO−OPEN
LEVER
FORWARD TOILET SERVICE PANEL
1
Figure 15
FRA US/E ur
Oct. 1999
NOT ON ALL AIRPLANES
Toilet System Schematic
Page: 31
B737−300/400/500
38−30
TOILET TANK
Location
The toilet waste tank is under a shroud in each lavatory.
Physical Description/Features
The shroud covers the tank and contains the toilet seat and cover. Each tank
consists of a fiberglass tank with a laminated stainless steel/fiberglass top. The
forward and aft toilet tanks are not interchangeable.
Flushing equipment consists of a flush handle, timer, motor, pump, filter, and
related tubing. All these items, except the flush handle and timer, are attached
to the top of the tank. The flush handle and timer are located on the cabinet
above the toilet. A stainless steel toilet bowl is attached to the tank top. The
bowl is fitted with a hinged separator between the bottom of the bowl and the
tank. A perforated flush line is used for tank cleaning.
The tank is held in position by three tie−down rods. It is positioned over a drain
hole in the floor and connected to an exterior drain line.
For Training Purposes Only
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
FRA US/E ur
Oct. 1999
Page: 32
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
COLLAR
TOILET
TANK
SHROUD
TOILET TANK
SHROUD
TIMER
SHROUDS EXAMPLE
GROUND FLUSH LINE
SHROUDS EXAMPLE
NUT
BONDING
JUMPER
For Training Purposes Only
TOILET FLUSH
MOTOR
TIE−DOWN ROD
INBD
FWD
DRAIN VALVE CONTROL
CABLE QUICK−DISCONNECT
Figure 16
FRA US/E ur
Oct. 1999
Toilet Tank Location
AFT TOILET EXAMPLE
(LAVATORY B SHOWN)
Page: 33
B737−300/400/500
38−30
TOILET SERVICE PANELS / TOILET SERVICING
Physical Description/Features
There are separate external toilet service panels, one forward and one aft, on
the right side of the fuselage. Each service panel includes a four−inch drain
outlet; a ground flush line fitting and a drain valve control handle is provided for
each toilet tank. A four−inch tube connects the toilet tank to the toilet service
panel. The toilet drain outlet is a standard Roylyn plug with a hinged cap on the
outside.
For Training Purposes Only
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
FRA US/E ur
Oct. 1999
Page: 34
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
DRAIN CAP
FOR THE
WASTE TANK
AFT SERVICE
PANEL
DRAIN CAP
FOR THE
WASTE TANK
FORWARD
SERVICE
PANEL
WASTE TANK
DRAIN NIPPLE
CLOSED
LEVER
PUSH−TO−OPEN
LEVER
WASTE TANK
SERVICE PANEL
For Training Purposes Only
2
OPEN
LEVER
FWD
DRAIN CAP
FOR THE
WASTE TANK
WASTE TANK
SERVICE PANEL
DRAIN CAP FOR
THE WASTE TANK
1
2
1
Figure 17
FRA US/E ur
Oct. 1999
AIRPLANES WITH OPEN AND CLOSED LEVERS
AIRPLANES WITH PUSH−TO−OPEN LEVER
Toilet Service Panel
Page: 35
Lufthansa Technical Training
For Training Purposes Only
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
TOILET SYSTEM (CONFIG. 1)
Operation
When the flush control is activated, the motor operates a pump inside the tank
and pumps water into the bowl flush ring. The motor drives a filter drive pinion
shaft which rotates a filter basket. The basket surrounds the pump inlet to prevent objects entering the pump inlet. A fixed wiper blade on the outer surface of
the impeller housing keeps the surface of the basket open. On aircrafts without
drain mast fluid in excess of the 17 U.S. gallon capacity will overflow through
the drain tube into the 15 U.S. gallon auxiliary toilet tank.
Maintenance Practices
A separator at the bottom of the toilet bowl hides the waste in the tank from the
passenger’s view. The flushing operation keeps the separator clean. If the flush
system should malfunction, the cabin attendant should push this hinged separator down, out of the way. During ground servicing the separator should be
checked to see that it is in the UP position. If it is not, a check should be made
of the flush operation and the separator pulled back to normal position. Replacement of the toilet flush motor requires removing the motor, pump and filter
basket as a unit.
Each toilet tank must be drained, flushed with clean water, and serviced with 3
U.S. gallons of water with the solution added.
The procedure is:
Connect the ground cart drain hose to the external service panel drain fitting.
Pull the drain valve control handle to open the drain valve in the bottom of
the toilet tank. Turn the handle to lock it in the open position.
When the toilet tank is completely drained, flush with clean water by connecting the water line to the ground flush line connection on the external
service panel. A minimum of 5 U.S. gallons of water should be used.
Close the drain valve by releasing the drain valve control handle.
Pump into the tank water with a solution of deodorant, dye, and disinfectant.
− NOTE: The total chemical precharge quantity is shown on the service
panel placard (The suggested amount 2 gallons).
Disconnect ground cart hose.
Close the drain outlet cap.
FRA US/E ur
Oct. 1999
CAUTION:
MAKE SURE THE DRAIN PLUG IS CORRECTLY LOCKED.
IF YOU DO NOT FEEL THE HANDLE YIELD, THE HANDLE
IS NOT CORRECTLY LOCKED. THIS CAN CAUSE LEAKAGE AT THE DRAIN PLUG. DO NOT PERMIT THE TOILET
FLUIDS TO TOUCH THE AIRPLANE STRUCTURE. THE TOILET FLUID CAN CAUSE CORROSION WHICH CAN CAUSE
DAMAGE TO THE AIRPLANE STRUCTURE MAKE SURE
THERE ARE NO STAINS ON THE AIRPLANE SKIN. STAINS
ON THE AIRPLANE SKIN CAN BE AN INDICATION OF AN
INFLIGHT LEAKAGE OR UNSATISFACTORY SERVICING
PROCEDURES. MAKE SURE THERE IS NO INFLIGHT ICE
BUILDUP FROM THE FORWARD TOILET SERVICE PANEL.
IF THERE IS AN ICE BUILDUP AND IT IS RELEASED INFLIGHT, IT CAN CAUSE DAMAGE TO THE NO. 2 ENGINE
OR THE AIRPLANE STRUCTURE.
Page: 36
B737−300/400/500
38−30
For Training Purposes Only
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
Figure 18
FRA US/E ur
Oct. 1999
Toilet Tank Schematic Without Auxiliary Tank (Config.1)
Page: 37
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
For Training Purposes Only
THIS PAGE INTENTIONALLY LEFT BLANK
FRA US/E ur
Oct. 1999
Page: 38
B737−300/400/500
38−30
For Training Purposes Only
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
Figure 19
FRA US/E ur
Oct. 1999
Toilet Tank Schematic With Auxiliary Tank (Config.2)
Page: 39
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
TOILET SYSTEM (CONFIG. 2)
Normal Sequence
When the flush control is activated, the motor operates a pump inside the tank
and pumps water into the bowl flush ring.
For Training Purposes Only
Servicing
A separator at the bottom of the toilet bowl hides the waste in the tank from the
passenger’s view. The flushing operation keeps the separator clean. During
servicing, the separator should be in the UP position. If it is not, a check should
be made of the flush operation and the separator pulled back to normal position.
Each toilet tank and the aft auxiliary tank should be drained, flushed with clean
water, and serviced individually.
The ground cart service hose is connected to the service panel external drain
fitting. At the forward service panel, the drain valve control handle is pulled to
open the ball valve and the drain valve. The handle is turned to lock it in the
open position. At the aft service panel, pulling the drain valve control handle
opens the tank drain valve.
When the toilet tank is completely drained, the flush line cap is opened and
clean water is pumped into the tank through the ground flush line connection. A
minimum of 5 U.S. gallons of water should be used.
The drain valve and the ball valve are closed by turning and releasing the drain
valve control handle.
Water with a solution of deodorant, dye, and disinfectant must be pumped into
the tank as a precharge.
NOTE: The total chemical precharge quantity is shown on the service panel
placard (The suggested amount 2 gallons).
FRA US/E ur
Oct. 1999
Page: 40
B737−300/400/500
38−30
For Training Purposes Only
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
1 FORWARD DRAIN LINE ONLY
Figure 20 Toilet Tank Schematic Without Auxiliary Tank (Config.2)
FRA US/E ur
Oct. 1999
Page: 41
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
For Training Purposes Only
THIS PAGE INTENTIONALLY LEFT BLANK
FRA US/E ur
Oct. 1999
Page: 42
B737−300/400/500
38−30
For Training Purposes Only
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
Figure 21
FRA US/E ur
Oct. 1999
Toilet Tank Schematic With Auxiliary Tank (Config.2)
Page: 43
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
B737−300/400/500
38−30
FORWARD LAVATORY BALL VALVE
Purpose
The forward lavatory ball valve prevents waste from moving downstream in the
drain line.
Location
The ball valve is located between the toilet drain valve and the forward service
panel drain valve. The valve is only in the forward toilet tank drain line and is in
the electronic equipment compartment, forward of the E1 rack.
Physical Description
The valve consists of a spherical ball enclosed in a spherical housing. The inner spherical ball mechanically opens and closes when the valve positioning
lever rotates. Pulling the drain valve control handle at the forward service panel
will rotate the valve positioning lever through a cable assembly. The toilet tank
drain valve is connected to the upper arm of the valve positioning lever through
a cable assembly.
For Training Purposes Only
Operation
Pulling the drain valve control handle on the service panel opens the ball valve
and the toilet tank drain valve.
FRA US/E ur
Oct. 1999
Page: 44
B737−300/400/500
38−30
For Training Purposes Only
Lufthansa Technical Training
WATER & WASTE
WASTE DISPOSAL
Figure 22
FRA US/E ur
Oct. 1999
Forward Lavatory Ball Valve
Page: 45
Lufthansa Technical Training
WATER & WASTE
WATER LINES
B737−300/400/500
30−70
30−70
WATER AND TOILET DRAIN ANTIICING SYSTEM
TOILET DRAIN- AND DRAIN MAST HEATERS
For Training Purposes Only
Toilet Drain Heaters
The aft toilet drain has a heater to stop ice formation. The heater is in the drain
gasket. The heater operates with 115V AC.
On some airplanes, the forward toilet drain has a heater in the drain gasket.
The heater operates with 115V AC. The DRAIN HEATER circuit breaker is located on the P18−3 panel.
Drain Mast Heaters
The forward and aft water drain masts are electrically heated to prevent ice
from forming and blocking the drain. The heating elements operate on either 28
Volts AC for low heat ground operation or 115 Volts AC for high heat during
airborne operation. Low heat power is supplied from the 28 Volt AC Main Bus
No. 2 through the DRAIN MAST HEATER−GND circuit breaker, and high heat
power is supplied from the 115 Volt AC Main Bus No. 1 through the DRAIN
MAST HEATER−AIR circuit breaker. Both circuit breakers are located on the
P18−3 panel.
A ribbon heater tape is wrapped around the forward drain mast line. It prevents
freezing of the line.
For low heat ground operation of the drain masts, 28 Volt AC power is provided
by two relays, a landing gear air sensing relay and an external power sensing
relay. When the airplane is in the air, 115 Volt AC power is used for heating the
drain masts; but, upon landing, the landing gear air sensing relay is de−energized, thereby switching to the 28 Volt AC power supply for low heat ground
operation to prevent the heater from overheating and possibly burning out the
heating element. Additional protection against overheating of the drain masts is
provided by the external power sensing relay which prevents inadvertent application of 115 Volts AC to the heater during maintenance in the event the airplane is raised on jacks. The external power sensing relay is energized when
external power supplies the airplane.
FRA US/E ur
Oct. 1999
Page: 46
Lufthansa Technical Training
WATER & WASTE
WATER LINES
B737−300/400/500
30−70
115V AC
BUS 2
GASKET
HEATING
ELEMENT
1
C233
DRAIN
HEATER
FWD TOILET
DRAIN HTR
AFT TOILET
DRAIN HTR
115V AC
BUS 1
AIR
C700
DRAIN MAST
HEATER−AIR
R47 EXTERNAL
POWER
SENSING
RELAY (P6)
28V AC
BUS 2
For Training Purposes Only
C234
DRAIN MAST
HEATER−
GROUND
GND
R282 AIR
SENSING
RELAY
E11 LANDING GEAR
LOGIC SHELF
HEATER
P18−3 CIRCUIT BREAKER
PANEL
1
FWD DRAIN
LINE HTR
not on all airplanes
FWD DRAIN
MAST HTR
DRAIN MAST
AFT DRAIN MAST HTR
Figure 23
FRA US/E ur
Oct. 1999
Water Water and Toilett Drain Anti-Icing System
Page: 47
B737−3 38 B1 E
TABLE OF CONTENTS
ATA 38 WATER AND WASTE . . . . . . . . . . . . . . . . .
1
38-00
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WATER & WASTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
2
38−10
POTABLE WATER SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . .
WATER SYSTEM LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WATER SERVICE PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WATER SYSTEM SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SINK CABINET COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WATER HEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WATER TANK DRAIN COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . .
WATER TANK QUANTITY INDICATION SYSTEM . . . . . . . . . . . . . . . .
4
4
6
10
12
14
16
18
38−40
WATER PRESSURIZATION SYSTEM . . . . . . . . . . . . . . . . . .
WATER TANK AIR PRESSURIZATION . . . . . . . . . . . . . . . . . . . . . . . . . .
20
20
38−30
WASTE DISPOSAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOILET COMPARTMENT INTRODUCTION . . . . . . . . . . . . . . . . . . . . .
TOILET SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOILET TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOILET SERVICE PANELS / TOILET SERVICING . . . . . . . . . . . . . . .
TOILET SYSTEM (CONFIG. 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOILET SYSTEM (CONFIG. 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FORWARD LAVATORY BALL VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . .
26
26
30
32
34
36
40
44
30−70
WATER AND TOILET DRAIN ANTI-ICING SYSTEM . . . . .
TOILET DRAIN- AND DRAIN MAST HEATERS . . . . . . . . . . . . . . . . . .
46
46
FRA US/T-4 Roth
Jun 2005
Page i
B737−38 B1 E
TABLE OF FIGURES
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Water and Waste System Diagram . . . . . . . . . . . . . . . . . .
Water System Location . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Service Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Tank Components . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sink Cabinet Components . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Tank Drain Components . . . . . . . . . . . . . . . . . . . . . .
Water Tank Quantity Indication System . . . . . . . . . . . . . . .
Water Tank Pressurization System Schematic . . . . . . . .
Water Tank Pressurization Compressor Circuit . . . . . . .
Water Tank System Components Location . . . . . . . . . . .
Water Waste Components Location . . . . . . . . . . . . . . . . .
Water Waste Components Location (cont.) . . . . . . . . . .
Toilet System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . .
Toilet Tank Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Toilet Service Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Toilet Tank Schematic Without Auxiliary Tank (Config.1)
Toilet Tank Schematic With Auxiliary Tank (Config.2) . .
Toilet Tank Schematic Without Auxiliary Tank (Config.2)
Toilet Tank Schematic With Auxiliary Tank (Config.2) . .
Forward Lavatory Ball Valve . . . . . . . . . . . . . . . . . . . . . . .
Water Water and Toilett Drain Anti-Icing System . . . . . .
FRA US/T-4 Roth
Jun 2005
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
Page ii
For:batch
Printed on:Thu, Aug 11, 2005 09:50:28
From book:B737-3 38 B1 E
Document:Deckblatt B737-3 J
Last saved on:Thu, Aug 11, 2005 09:49:51
Document:01/ATA_DOC
Last saved on:Thu, Aug 11, 2005 09:49:56