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 C.  On some airplanes a secondary drain valve is fitted to prevent overboard discharge of water during flight when the valve is inadvertently move to the drain position.
 D.  Most of the water distribution system is flexible teflon hose with reinforced fiber covering. Metal fittings and connectors are used at junctions and line replaceable units. Distribution lines route from below the water tank to above the cabin ceiling and enter galleys and lavatories from above.
 E.  Each lavatory has a water heater in the supply line to the washbasin faucet.
 F.  The passenger water system quantity indicator shows the flight crew the amount of water in the passenger water tank. The water quantity transmitter sends quantity signals to the water quantity indicator.
 G.  The passenger water tank is normally pressurized by engine bleed air taken from the pneumatic manifold which pressurizes the APU manifold to move fresh water from the water tank to the lavatories and galleys. The water tank pressurization system includes check valves, an air filter, a pressure regulator, and a pressure relief valve (AMM 38-41-00/001).
Water Tank (Fig. 1)
__________
 A.  The water tank is aft of the bulk cargo compartment on the right side of the airplane. Vertical support members attach the tank to the fuselage frame.
 B.  The water tank is cylindrical with rounded ends. The tank is nonmetallic filament wound fiberglass. Two bands reinforce the tank and provide mounting support.
 C.  The volume of the tank is 34 gallons. Tank capacity is limited to 30 gallons by a standpipe installed within the tank and connected to the overflow line.
 D.  The water tank is protected from freezing by a 3-piece fiberglass
 blanket. The blanket is installed using velcro fasteners.Service Panel (Fig. 2)
_____________
 A.  The passenger water system service panel is on the fuselage below the aft entry door. The service panel has both inlet and outlet ports for the fill/overflow valve. Also on the service panel is a control handle for the fill/overflow valve, a drain handle to operate the potable water drain valve, and a fitting for ground service air.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
POTABLE WATER SUPPLY LINE

POTABLE WATER SUPPLY TO LAVATORY A
FORWARD COMPONENTS

NOT INSTALLED ON ALL AIRPLANES
Passenger Water System Equipment Location Figure 1 (Sheet 1)
G98687
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 38-11-00
 ALL  ú ú 05 Page 2 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

TANK DRAIN VALVE AND
Passenger Water System Equipment LocationFigure 1 (Sheet 2)

C47613
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 38-11-00
 GALLEY 4B.  ú
 ú 01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 3Jul 12/99 

A

737-300/400/500MAINTENANCE MANUAL
WATER SUPPLY TO GALLEY NO. 4
1
WATER SUPPLY TO GALLEY NO. 3
LAVATORY B 1
POTABLE WATER SUPPLY LINE POTABLE WATER SUPPLY TO LAVATORY B
DRAIN VALVE
DRAIN FITTINGWATER TANK
SEE A
POTABLE WATER SUPPLY TO DRAIN
NO. 4 LAVATORY VALVE
LAVATORY D
11
NO. 4 LAVATORY OR LAVATORY D AFT COMPONENTS
TO COMPRESSOR
1
PRESSURE RELIEF VALVE
PRESSURE REGULATOR
AIR FILTER  POTABLE WATER 
AIR PRESSURE  SUPPLY LINE 
SUPPLY LINE  FILL AND 
CHECK VALVE  OVERFLOW VALVE 
POTABLE WATER 
SUPPLY LINE 
WATER TANK 
1 
TANK DRAIN  WATER 
VALVE (FIG. 2)  OVERFLOWWATER 
TANK DRAIN LINE  FILL  LINE 
　
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本文鏈接地址：737-300 400 500 AMM 飛機(jī)維護(hù)手冊 WATER AND WASTE(3)