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Functional Description
The fill/overflow valve has these functions:
* Lets water flow into the water tank from the potable water fill
fitting
* Lets air out of the water tank to vent overboard as the tank
fills with water
* Lets water flow overboard when water volume reaches the
standpipe
* Depressurizes the water tank for system service or
maintenance.
The control cable has a rotary actuator input at the water
service panel. The control cable transmits movement to the fill/
overflow valve at a rotary actuator on the valve.
When you put the fill/overflow valve in the open position, the
potable water fill line connects to the water tank fill line and the
water tank overflow line connects to the potable water drain
line.
When you put the fill/overflow valve in the closed position, the
potable water fill line connects to the potable water drain line
and the water tank fill line connects to the water tank overflow
line.
WATER/WASTE - PASSENGER WATER SYSTEM - FILL/OVERFLOW VALVE AND CONTROL CABLE
EFFECTIVITY
GUN ALL 38-11-00
Page 4
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-11-00-002
WATER/WASTE - PASSENGER WATER SYSTEM - FILL/OVERFLOW VALVE AND CONTROL CABLE
WATER/WASTE - PASSENGER WATER SYSTEM - FILL/OVERFLOW VALVE AND CONTROL CABLE
EFFECTIVITY
GUN ALL 38-11-00
Page 5
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-11-00-002
Purpose
The water tank drain valve lets water drain overboard from the
water tank and the aft water distribution lines.
The control cable lets you open and close the water tank drain
valve from the water service panel.
Location
The water tank drain valve is behind the aft bulkhead of the aft
cargo compartment. The valve is forward and below the water
tank.
The control cable is below the cargo floor and is between the
water service panel and the water tank drain valve.
Physical Description
The water tank drain valve is a two-port, single-ball, dual-seal
valve. The valve operates by manual input and has open and
closed positions. The control cable is a rotary-in rotary-out
cable.
The control cable attaches the water tank drain valve handle on
the water service panel to the water tank drain valve.
Functional Description
The control cable has a rotary actuator input at the water
service panel. The control cable transmits movement to the
water tank drain valve at a rotary actuator on the valve.
Training Information Point
You must drain the water system at two locations to remove all
the water in the passenger water system. To fully drain the
water system, use the forward lavatory drain valve and the
water tank drain valve.
WATER/WASTE - PASSENGER WATER SYSTEM - WATER TANK DRAIN VALVE AND CONTROL CABLE
EFFECTIVITY
GUN ALL 38-11-00
Page 6
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-11-00-005
WATER/WASTE - PASSENGER WATER SYSTEM - WATER TANK DRAIN VALVE AND CONTROL CABLE
WATER/WASTE - PASSENGER WATER SYSTEM - WATER TANK DRAIN VALVE AND CONTROL CABLE
EFFECTIVITY
GUN ALL 38-11-00
Page 7
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-11-00-005
Purpose
The water tank holds potable water.
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
　
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