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1. General (Fig. 1 and 2)
A.  The passenger water system supplies drinkable (potable) water to the galley units and lavatory compartments. The water system includes equipment to store, pressurize, monitor, deliver, control, and heat the water supplied to the various components. Water for the system is stored in a pressurized tank. The water tank is normally pressurized by engine bleed air from the No. 1 engine. For other pressure sources refer to 38-41-0, Water Tank Pressurization System. The quantity of water in the tank is monitored by a quantity transmitter on the tank and one or more quantity indicators (Fig. 1). The passenger water system is controlled by a fill and overflow valve, drain valves, and vent valves (on airplanes with turn-to-flow faucets). Water supplied to the hot water tap in lavatory compartments is heated by an electric heater.
2.  Passenger Water Tank (Fig. 1 and 2)
A.  The passenger water tank has fittings attached to the top for system filling, overflow, galley and lavatory supply, system pressurization, and a float-type quantity transmitter. A drain fitting is located on the bottom of the tank. The volume of the tank is 34 gallons with a standpipe on the overflow line to limit capacity to 20 or 30 gallons (Fig. 2). The tank is mounted on the right side of the airplane behind the aft cargo compartment.
3.  Quantity Indicating System (Fig. 1 and 5)
A.  The passenger water system quantity indicating system indicates water quantity in the passenger water tank. The system consists of a float-type transmitter on top of the tank and one or more indicators (Fig. 1) . Changes in the tank water level cause different switches in the transmitter tube to be energized, controlling illumination of the water quantity indicator bulbs. When the pushbutton switch on the indicator is pushed, the applicable bulb(s) illuminate to show water quantity.
4.  Water System Plumbing
A.  The passenger water system plumbing consists of reinforced plastic hose. Supply plumbing hose is enclosed in aluminum conduit.
B.  For the material of any specific hose assembly refer to Boeing Illustrated Parts Catalog.
5C8 
Jun 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-11-0 Page 1 

EFFECTIVITY
AIRPLANES WITH
DRAIN MASTS

F89855
Passenger Water System Equipment Location  5C8 
38-11-0  Figure 1 (Sheet 1)  May 01/00 
Page 2 

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
AIRPLANES WITHOUT
DRAIN MASTS

 

F90255 F90138
5C8  Passenger Water System Equipment Location 
May 01/00  Figure 1 (Sheet 2)  38-11-0 
Page 3 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 

Passenger Water System Components Location  5C8 
38-11-0  Figure 1 (Sheet 3)  Jun 20/85 
Page 4 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

5C8  Passenger Water System Schematic 
May 01/00  Figure 2  38-11-0 
Page 5 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

5.  Water System Valves
A.  Fill and Overflow Valve (Fig. 1)
(1)  The fill and overflow valve controls filling of the passenger water system. The valve is a four-port machined body with a rotary core. The rotary core is spring-loaded to ensure positive seating and prevent leakage. The valve is operated by a handle attached to the rotary core by a short stem. It is a 2-way valve with an OPEN and a CLOSED position. During flight the valve must be in the CLOSED position. The OPEN position permits filling of the water tank. The fill and overflow valve is located just above the water service panel. Plumbing from the fill and overflow valve is connected to the water service panel located on the airplane fuselage below the aft entry door. The panel contains a fill connection and an overflow outlet.
B.  Drain Valves
(1)  
Lavatory Drain Valves (Fig. 3)

(a)  
Each lavatory is provided with a drain valve which controls potable water drainage of lavatory compartment plumbing. The valve has 3 positions: OFF, DRAIN and ON. In the OFF position all lines are completely closed. In the DRAIN position all lines are completely open. In the ON (normal) position, the water inlet and outlet lines are open and the drain line is closed. The valve is accessible in the lower part of the lavatory sink cabinet below the water heater.

(b)  
On airplanes with forward lavatory, a secondary drain valve may be installed to prevent in flight accidental drainage. The existing 3-way drain valve is designated the primary drain valve. The secondary drain valve is a 2-way valve with an OPEN and a CLOSED position. The secondary valve is accessible in the lower part of the lavatory sink cabinet.
　
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