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lavatory water system. Water is also supplied to each galley.
BCD WATER AND WASTE SYSTEM - WASTE SYSTEM
Drain water from the galleys and lavatory sinks goes out a forward and aft drain
mast. Each mast is automatically heated to prevent water freezing in the drain.
Waste from each toilet goes to a single waste collection tank behind the aft
baggage compartment. The waste is moved to the tank by water and differential
air pressure. When a toilet is flushed, a measured amount of water rinses the
toilet bowl through the rinse valve. The flush valve opens to allow the toilet
bowl contents into the vacuum drain line to the waste tank. Air is evacuated
from the waste tank through a liquid separator by a vacuum blower, which
keeps the tank at a lower pressure than the cabin. Above 16,000 feet, the
blower does not operate, as cabin to exterior differential pressure is sufficient.
AIRCRAFT GENERAL
Sec. 6.1 Page 50 737
Rev. 11/15/02 #41 Continental Flight Manual
A continuous level sensor in the waste tank sends signals to a quantity indicator
on the aft flight attendant panel. Two point level sensors determine when the
tank is full. Water and flush valves for all toilets are shut off when the tank is
full.
If a flush valve should fail in the open position, differential pressure would
escape overboard continuously. The shroud around the toilet assembly has a
cutout at the bottom. This gives access to a handle, which can manually close
the flush valve for that toilet.
The waste tank is emptied through a waste drain valve operated from a service
panel on the aft lower left fuselage. After the tank is drained, it is rinsed by
water through two rotating nozzles in the top of the tank. This should clean the
sensors along with the rest of the tank. A light on the aft flight attendant waste
panel illuminates when a sensor is dirty. If both point level sensors are dirty, a
full tank signal may be generated. This would illuminate a lavatories inop light
on the aft flight attendant panel and disable all toilet rinse valves and flush
valves. Once the tank has been rinsed and emptied, a chemical precharge is
added.
GALLEYS
Galleys are located in the passenger cabin so as to provide convenient and rapid
service to the passengers. Generally, they are installed in the cabin adjacent to
the forward and aft galley service doors.
In general the equipment of the galley unit consists of the following main items:
- high-speed ovens
- hot beverage containers
- hot cup receptacles
- refrigeration and main storage compartments.
Electrical control panel switches and circuit breakers to operate the above
equipment are conveniently located. Storage space, miscellaneous drawers and
waste containers are also integrated in the galley units.
AIRCRAFT GENERAL
737 Sec. 6.1 Page 51
Flight Manual Continental Rev. 11/15/02 #41
Electrical Power
>>@ Electricity for the galleys is 115V AC 400 Hz supplied from the
aircraft generator busses and controlled by a switch on the overhead panel.
Circuit breakers are located on the galleys and on the P-6 circuit breaker panel.
BCD Electricity for the galleys is 115V AC supplied from the aircraft
transfer busses and controlled by a switch on the overhead panel. Circuit
breakers are located in the lower E/E bay as part of the power distribution
panels.
WATER SERVICE
Water is supplied to the galleys from the aircraft pressurized water system and,
in an emergency, may be shut off at the galleys.
3737614
1
1
1
1
No. 3A
No. 6A
GALLEYS
No. 2
No. 4B
GALLEY
UNIT
GALLEY
UNIT
No. 1
1 As installed
AIRCRAFT GENERAL
Sec. 6.1 Page 52 737
Rev. 11/15/02 #41 Continental Flight Manual
>>@ Water System Controls
< Water Quantity Indicator
Push – Lights illuminate to indicate quantity of water in reservoir.
Example: With reservoir half full, the E, ¼, and ½ lights illuminate.
= Water System Service Panel
> Air Valve
Pressurizes tank and system when normal pressure sources are not
available.
AIRCRAFT GENERAL
737 Sec. 6.1 Page 53
Flight Manual Continental Rev. 11/15/02 #41
? Overflow Fitting
Prevents overfilling of tank and allows venting of tank when gravity
draining.
@ Access Panel
Cannot be closed unless the fill and overflow valve and tank drain valve
handles are in the closed position.
A Fill and Overflow Valve Handle
OPEN – Enables filling or gravity-draining water tank.
CLOSED – Normal position.
B Fill Fitting
Used to fill tank.
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