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BCD The potable water quantity indicator is located on the aft flight
attendant panel. The water quantity shows continuously, there is no button.
The system is pressurized when the left engine or the APU is running. A shutoff
valve is located in the cabinet below the sink in each lavatory. The drain
position of this valve is used to drain all water overboard. Normally, the drain
shutoff valves will be ON.
HOT WATER
Hot and cold water is available in the lavatories. The water heater is located
below the lavatory sink and maintains a water temperature of 125°F (52°C) to
133°F (56°C). When emptied, it will heat a new water charge in four minutes.
An amber light is illuminated when the heater is operating normally. The heater
has an overheat switch which turns off the heating element at 190°F (88°C).
The heater may be turned off at any time by using a manual switch on the heater.
Hot and cold water is also supplied at the galleys.
SERVICING
The system is serviced from an exterior panel on the aft fuselage. Pressure
filling is required. Wastewater from the galleys and lavatory wash basins is
drained overboard through two heated drain masts. The drain masts are on the
bottom of the fuselage; one forward and one aft.
AIRCRAFT GENERAL
Sec. 6.1 Page 46 737
Rev. 11/15/02 #41 Continental Flight Manual
DISTRIBUTION
LINE
LAVATORY
AIR PRESSURE
LINE
QUANTITY
INDICATOR
LAVATORY
WATER TANK
EXTERNAL
SERVICE
3737616
GALLEY (TYP)
WATER AND WASTE SYSTEM
AIRCRAFT GENERAL
737 Sec. 6.1 Page 47
Flight Manual Continental Rev. 11/15/02 #41
WATER AND WASTE SYSTEM – WASTE SYSTEM
>>@ Each lavatory has an independent toilet waste system. Toilet waste
is stored in a toilet tank in each lavatory. During ground servicing the toilet
tanks are drained, rinsed and a chemical precharge is added. The tanks are
vented to the lavatory vent system.
A stainless steel toilet bowl attaches to the top of each tank. A separator
between the tank and toilet bowl prevents passengers from seeing into the tank
and liquid in the tank from sloshing up into the bowl.
Each toilet waste tank has a motor-pump filter unit that pumps filtered flushing
fluid into the toilet bowl. Activating the toilet flush handle powers the pump for
ten seconds.
MIRROR
USED RAZOR
BLADES
RETURN TO
SEAT SIGN
CALL BUTTON
FAUCET
USED TOWEL
AND CUP
DISPOSAL
WASH BASIN
TOILET PAPER
AUTOMATIC FIRE
EXTINGUISHER
ROTATED 180° (INSIDE CABINET)
ASH TRAY
SEAT COVERS
SANITARY NAPKINS
SICK BAG DISPENSER
TOILET
FLUSH
LEVER
TOILET
SEAT
BUMPER
TOILET
GASPER AIR
SERVICE UNIT (SPEAKER
DOME LIGHTS)
OXYGEN MASKS (2)
PAPER CUPS
PAPER TOWELS
CLEANING
TISSUE
FLUORESCENT
LIGHT
3737617
AIRCRAFT GENERAL
Sec. 6.1 Page 48 737
Rev. 11/15/02 #41 Continental Flight Manual
BCD WATER AND WASTE SYSTEM – WATER SYSTEM
The water and waste system in the new generation B737 has a much larger
water tank than earlier models. In addition to galley water and lavatory sinks,
water is used for waste disposal.
The water tank is located beneath the cabin floor and behind the aft cargo
compartment. The tank is pressurized by pneumatic system air, which forces
the water up and out of the tank. If no pressure is available from the pneumatic
system, an AC motor driven compressor turns on automatically and builds the
tank pressure. As long as pressure is available from the pneumatic system, the
compressor will not run.
AIRCRAFT GENERAL
737 Sec. 6.1 Page 49
Flight Manual Continental Rev. 11/15/02 #41
The water service panel is on the bottom of the aft right side of the fuselage.
Opening the door operates a switch which disables the compressor. Once the
water hose is connected, opening the fill and overflow valve vents tank pressure
and allows water to fill the tank and come out the overflow. There is also a
drain valve handle for draining the tank. Both valve handles must be in the
closed position or the service panel access door will not close. A panel at the
aft flight attendant station shows the quantity of water in the tank.
Each lavatory has a water shutoff valve beneath the sink. With the valve in the
SUPPLY ON position water is provided to the lavatory sink and the toilet. The OFF
position shuts off water to the sink and toilet. Two other positions allow water
to the faucet only or the toilet only. There is a drain valve for draining each
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