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Pneumatic System
The pneumatic system supplies pressurized air to the water
tank when the pneumatic system is on.
The pneumatic system supply line gets air from a tap on the
pneumatic manifold forward of the APU check valve.
An in-line air filter cleans the air in the pneumatic system supply
line.
A pressure regulator controls the pneumatic system supply line
pressure to a maximum of 35 psig.
Air Compressor
The air compressor supplies pressurized air to the water tank
when the pneumatic system is off and these conditions are true:
* Pressure in the water tank is less than 30 psig (pressure limit
switch is closed)
* Water service panel door is closed (compressor cut-out
switch is closed)
* 115v ac main bus 1 is on.
The air compressor gets air from a muffler above the ceiling of
the cargo compartment. An air filter at the inlet of the air
compressor cleans the air in the air compressor supply line.
The pressure limit switch opens and stops the operation of the
air compressor when the air pressure in the water tank
increases to 40 psig. When the pressure decreases to 30 psig,
the pressure limit switch closes and the air compressor starts.
Training Information Point
WARNING: SEAL THE CARGO COMPARTMENT WITH THE
LINING. OBEY THE INSTRUCTIONS IN THE
SPECIFIED PROCEDURE WHEN YOU INSTALL
THE LINING. IF YOU INSTALL THE LINING
INCORRECTLY, THE FIRE EXTINGUISHING
AGENT OR SMOKE CAN GET INTO THE
PASSENGER COMPARTMENT DURING A FIRE.
To get access to the water tank pressurization system
components, you remove the cargo compartment lining. When
you are done, you must replace and seal the cargo
compartment lining.
WARNING: MAKE SURE THERE IS NO PRESSURE IN THE
PNEUMATIC PRESSURE LINES BEFORE YOU
DISCONNECT THEM. THE HIGH PRESSURE/
TEMPERATURE AIR IN THE LINES CAN CAUSE
INJURY TO PERSONS.
WATER/WASTE - WATER TANK PRESSURIZATION - FUNCTIONAL DESCRIPTION
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Before you remove water tank pressurization system
components, you must release the pressure from the system.
You can open the fill/overflow valve to release the pressure
from the pneumatic pressure lines. To open the fill/overflow
valve, use the valve handle at the water service panel.
To stop operation of the air compressor, open the water service
panel.
WATER/WASTE - WATER TANK PRESSURIZATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 38-42-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-42-00-010
WATER/WASTE - WATER TANK PRESSURIZATION - FUNCTIONAL DESCRIPTION
WATER/WASTE - WATER TANK PRESSURIZATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 38-42-00
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38-42-00-010
CHAPTER
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Auxiliary Power System
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