Potable Water System - Component Location
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C24292
A
747-400
MAINTENANCE MANUAL

WASHBASIN FAUCET SEE E
LAVATORY SINK CABINET
D

MUFFLER (REF)
WATER HEATER (REF)
CABINET WITH DOOR
SHUTOFF VALVE
YLMM-38-11-0146
OUTLET
FITTING
(UNDER)

BLEED VALVE CAPSCREW (UNDER)
FAUCET ASSEMBLY
E
Potable Water System - Component Location Figure 1 (Sheet 3)
DRAIN ACTUATOR
SPIGOT BUTTON CARTRIDGE CAP
CARTRIDGE
C24220
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
COMPRESSOR (REF)

Portable Water System
Figure 2

C24199
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B.  The faucet assembly also includes a washbasin stopper which is spring loaded to the closed position to reduce cabin pressure loss thru the drain system.
 4.  Fill/Drain Valve
________________
 A.  The fill/drain valve is a rotary two-port valve with two positions; open and closed. The valve is located in the fill line that connects the storage tanks to the water service panel. The valve is opened or closed when the toggle switch at the service panel is moved to the open or close position. With the valve in the open position, the valve allows the tanks to be filled or drained.
 5.  Overflow/Depressurization Valve (Overflow Valve)
_______________________________
 A.  The overflow valve is installed in the line junction that connects the pneumatic manifold to the water tanks and the overflow fitting to the water tanks. The valve is electrically operated by the compressor/bleed air interlock switch on the service panel door.
 B.  When the service panel door is open, the compressor/bleed air interlock switch causes the valve to move to the fill position. This position shuts off the air from the pneumatic manifold to the water tanks. At the same time, the fill position permits the overflow water from the tanks to flow overboard through the overflow fitting on the service panel.
 C.  When the service panel door is closed, the compressor/bleed air interlock switch causes the valve to move to the flight position. This position lets the pressurized air from the pneumatic manifold get to the tanks. This position closes the port to the overflow line. The switch also gets electrical power to the air compressor when the door is closed.
 6.  Fill Fitting
____________
 A.  The bulkhead fill fitting is located at the water service panel. A clamshell type coupling connects the fill line to the upper end of the fill fitting. The connector at the lower end is a quick-disconnect type to which the servicing hose can be attached. A protective cap which is a part of the fill fitting assembly covers the fill fitting. The door for the service panel cannot be closed until the protective cap is latched on.
 7.  Lavatory Water Shutoff Valve
____________________________
 A.  The lavatory water shutoff valve is a two-port, two-position, open-close valve. It is located in the water supply line at each lavatory. The valve may be closed for performing maintenance on the lavatory plumbing.
 8.  Operation
_________
 A.  Servicing the Water System
 (1)  The water system is serviced at the water service panel. The water service panel is installed under the airplane and forward of the air conditioning access doors. When you open the water service panel door, the compressor stops and the overflow valve moves to the position that opens the overflow line from the water tanks to the overfill fitting.
　
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