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Location
The water tank is aft of the aft cargo compartment. You must
remove the aft bulkhead cargo lining to get access to the tank.
Physical Description
The water tank is a composite structure. The inner element is a
molded thermoplastic lining.
GUN 001-099, 201-999
The water tank capacity is 62.1 gallons (235 liters). A standpipe
decreases the maximum capacity to 60 gallons (227 liters).
GUN 101-118
The water tank capacity is 62.1 gallons (235 liters). A standpipe
decreases the maximum capacity to 40 gallons (151 liters).
GUN ALL
The water tank has these parts:
* Access cover (2)
* Water tank pressurization fitting
* Pressure switch
* Water overflow fitting (standpipe)
* Water fill fitting
* Water level sensor
* Drain fitting
* Bonding stud.
The water level sensor is a copper mesh capacitance sensor.
The sensor is bonded to the outside of the lining. The sensor is
a permanent part of the tank.
Training Information Point
The 62.1 gallon tank can have these sizes of standpipes:
* 40 gallon (151 liter)
* 50 gallon (189 liter)
* 60 gallon (227 liter).
The standpipes are interchangeable for different route
requirements. When you install a different standpipe, you
must also change the water quantity transmitter adapter cable.
If you do not use the correct transmitter adapter cable, the water
quantity indicator will not show the correct water level.
WATER/WASTE - PASSENGER WATER SYSTEM - WATER TANK
EFFECTIVITY
GUN ALL 38-11-00
Page 8
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-11-00-001
WATER/WASTE - PASSENGER WATER SYSTEM - WATER TANK
WATER/WASTE - PASSENGER WATER SYSTEM - WATER TANK
EFFECTIVITY
GUN ALL 38-11-00
Page 9
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-11-00-001
Purpose
The lavatory water supply shutoff valve lets you isolate the flow
of water to the lavatory components.
Location
Each lavatory has a lavatory water supply shutoff valve. You
open the sink cabinet door to get access to the valve. The valve
is in the lower area of the cabinet.
Physical Description
The lavatory water supply shutoff valve is a four-way valve. The
valve has a valve body and a control handle (yellow with a red
indicator point). These four positions show on the valve body:
* OFF
* TOILET ONlY
* SUPPLY ON
* FAUCET ONlY.
The valve has one line in and two lines out.
Functional Description
The valve handle lets you turn the valve to one of four positions.
When you turn the valve to the OFF position, the valve shuts off
water to all of the lavatory components.
In the TOILET ONLY position, water goes to the toilet only.
In the SUPPLY ON position, water goes to the faucet and toilet.
In the FAUCET ONLY position, water goes to the faucet only.
Training Information Point
Before you work on the lavatory components, turn the lavatory
water supply shutoff valve to the OFF position. When you turn
the valve to the OFF position, water will not flow through any
open lines.
You must turn the lavatory water supply shutoff valve to the
SUPPLY ON position when you drain the lavatory supply lines. If
you do not turn the valve to the SUPPLY ON position, then the
water will not drain from the faucet or toilet supply lines.
WATER/WASTE - PASSENGER WATER SYSTEM - LAVATORY WATER SUPPLY SHUTOFF VALVE
EFFECTIVITY
GUN ALL 38-11-00
Page 10
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-11-00-007
WATER/WASTE - PASSENGER WATER SYSTEM - LAVATORY WATER SUPPLY SHUTOFF VALVE
WATER/WASTE - PASSENGER WATER SYSTEM - LAVATORY WATER SUPPLY SHUTOFF VALVE
EFFECTIVITY
GUN ALL 38-11-00
Page 11
D633A101-GUN Oct 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-11-00-007
Purpose
The forward lavatory drain valve lets you drain the water from
the forward lavatory supply lines.
Location
The forward lavatory drain valve is only in lavatory A (the most
forward lavatory). You remove the sink cabinet panel to get
access to the valve. The valve is in the lower area of the
cabinet.
Physical Description
The forward lavatory drain valve operates manually. The valve
　
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