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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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
supply line.
The check valve has these features:
* Tube fittings
* Wrench flats
* Flow direction arrow.
WATER/WASTE - WATER TANK PRESSURIZATION - PNEUMATIC EQUIPMENT
EFFECTIVITY
GUN ALL 38-42-00
Page 7
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-42-00-012
Pressure Relief Valve
The pressure relief valve prevents an over-pressure condition
in the water tank pressure lines.
The pressure relief valve has these features:
* Wrench flats
* Tube fitting
* Pressure relief actuator.
The tube fitting connects to the same manifold as the two
pressurization sources.
If pressure in the pneumatic supply line increases to 60 psig, the
pressure relief valve opens. The valve resets at 55 psig.
WATER/WASTE - WATER TANK PRESSURIZATION - PNEUMATIC EQUIPMENT
EFFECTIVITY
GUN ALL 38-42-00
Page 8
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-42-00-012
WATER/WASTE - WATER TANK PRESSURIZATION - PNEUMATIC EQUIPMENT
WATER/WASTE - WATER TANK PRESSURIZATION - PNEUMATIC EQUIPMENT
EFFECTIVITY
GUN ALL 38-42-00
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
38-42-00-012
Purpose
The air compressor pressurizes the water tank when the
pneumatic system is not on.
The inlet air filter removes particles of unwanted material from
the air that goes into the water tank.
Location
The air compressor is on the left side of the aft cargo
compartment. You remove the forward waste access panel to
get access to the air compressor. The air compressor attaches
to the lower side the vacuum blower support shelf.
Physical Description
The air compressor has these parts:
* Inlet air filter
* Electrical connector
* Inlet
* Outlet
* Pressure relief valve.
The inlet air filter has these parts:
* Noise baffle
* Filter assembly
* Perforated disk
* Snap ring
* O-ring (2)
* Housing.
Functional Description
The three-phase AC motor operates the air compressor to
pressurize the water tank. The motor starts when the pressure
limit switch senses that tank pressure is less than 30 psig. The
motor stops when tank pressure is 40 psig. The air compressor
pulls air through the inlet air filter from the cargo ceiling area.
The inlet air filter element is a 40 micron, layered disk filter. The
filter housing attaches to the inlet side of the air compressor.
The pressure relief valve prevents the air compressor from
over pressurization. The pressure relief valve opens at 90 psig.
Training Information Point
You can replace the inlet air filter element.
WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR/INLET AIR FILTER
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