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swing check valves spring-loaded to the closed position. One
valve hinges away from the cargo compartment and the other
hinges to the cargo compartment.
Location
The forward cargo compartment has a pressure equalization
valve on the aft bulkhead.
The aft cargo compartment has a pressure equalization valve
on the forward portion of the vacuum waste bulkhead.
Functional Description
One valve lets air into the cargo compartment during airplane
pressurization and one valve lets air out of the cargo
compartment during airplane depressurization.
Training Information Point
The cargo compartments are tightly sealed by a fire resistant
liner. The liner isolates the cargo compartments from the
airplane air conditioning system. This is necessary for fire
protection.
The pressure equalization valves isolate the cargo
compartments from active air conditioning, but let cargo
compartment pressures change.
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The cabin altitude warning switch warns the flight crew when
cabin altitude is critical.
Location
The cabin altitude warning switch is on the ceiling in the
forward EE compartment.
General Description
The cabin altitude warning switch is an aneroid type switch.
When the cabin altitude gets to 10,000 ft above mean sea level,
the pressure warning switch closes.
This energizes the warning circuit and causes an intermittent
beep from the aural warning unit.
The ALT HORN CUTOUT push-button switch lets the crew
deactivate the warning alarm until the next high cabin altitude
event.
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Functional Description
When the 10,000 foot cabin altitude warning switch closes, these
things occur:
* The switch grounds the horn circuit which energizes the
system
* The aural warning module makes an intermittent beep
alarm.
When you push the ALT HORN CUTOUT switch on the cabin
altitude panel, these things occur:
* K1 relay energizes
* The aural warning module horn goes off
* K1 latches through the pressure switch.
When the cabin altitude goes below 10,000 feet, the switch
opens, and these things occur:
* K1 de-energizes
* The warning circuit is reset for the next event.
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