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WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - FUNCTIONAL DESCRIPTION
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The water tank pressurization system pressurizes the potable
water tank.
General Description
Pressure for the water tank comes from the pneumatic system
or the air compressor.
The water tank pressurization system has these functions:
* Controls the air pressure that goes into the water tank
* Selects the source of the pressurized air
* Prevents contamination from unwanted material in the air.
Abbreviations and Acronyms
* AC - alternating current
* fwd - forward
* psig - pounds per square inch gage
* ref - reference
* S - switch
* typ - typical
* V - volts
WATER/WASTE - WATER TANK PRESSURIZATION - INTRODUCTION
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WATER/WASTE - WATER TANK PRESSURIZATION - INTRODUCTION
WATER/WASTE - WATER TANK PRESSURIZATION - INTRODUCTION
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General
The water tank pressurization components are in the aft cargo
compartment.
The air compressor is forward of the waste tank on a shelf
below the vacuum blower.
The pneumatic equipment components are on the ceiling
forward of the aft cargo compartment bulkhead liner.
The water tank components are aft of the aft cargo compartment
bulkhead liner.
WATER/WASTE - WATER TANK PRESSURIZATION - COMPONENT LOCATION
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WATER/WASTE - WATER TANK PRESSURIZATION - COMPONENT LOCATION
WATER/WASTE - WATER TANK PRESSURIZATION - COMPONENT LOCATION
EFFECTIVITY
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Location
The pneumatic equipment is in the aft cargo compartment. You
remove the cargo compartment ceiling lining to get access to
the pneumatic equipment.
Physical Description
The pneumatic equipment installation has these components:
* In-line air filter
* Pressure regulator
* Check valves (2)
* Pressure relief valve.
In-Line Air Filter
The in-line air filter removes contamination from the pneumatic
system supply line.
The in-line air filter has these features:
* Inlet fitting
* Head
* Packing
* Air filter element
* Bowl
* Outlet fitting.
The filter element is a 10-20 micron paper filter element.
Two fasteners attach the in-line filter to the ceiling structure.
Pressure Regulator
The pressure regulator controls the air pressure that goes into
the water tank from the pneumatic system.
The pressure regulator has a circular disk-shape body and two
threaded fittings. One fitting is for the line from the pneumatic
system. The other fitting is for the line that goes to the water
tank.
The pressure regulator keeps the air pressure from the
pneumatic system to a limit of 35 psig.
Check Valves
The check valves prevent the loss of air pressure in the water
tank and do not let water into the water tank pressurization
system.
There are two check valves. There is a check valve in the air
compressor supply line and a check valve in the pneumatic
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