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AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The exhaust fans remove air from around electrical equipment
to remove heat.
General Description
There are two exhaust fans (normal and alternate) for the
exhaust system. Only one fan operates at a time.
Location
The exhaust fans and check valves are in the EE compartment.
You get access to the exhaust fans through the right partition
access panel of the forward cargo compartment.
Physical Description
The fans are single-stage fans with an integral induction motor.
They each have a check valve and install as a single unit. The
fans have thermal switches which protect the fans from
overheat damage.
Training Information Point
The exhaust fans install with v-band clamps. Arrows show the
proper flow direction. The exhaust fans are interchangeable.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - EXHAUST FANS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The airplane operates at altitudes where the oxygen density is
not sufficient to sustain life. The pressurization control system
keeps the airplane cabin interior at a safe altitude. This protects
the passengers and crew from the effects of hypoxia (oxygen
starvation). These are the sub-systems of the pressurization
control:
* Cabin pressure control system
* Cabin pressure relief system
* Cabin pressure indication and warning system.
Abbreviations and Acronyms
* ADIRU - air data inertial reference unit
* alt - altitude
* altn - alternate
* ARINC - Aeronautical Radio Incorporated
* auto - automatic
* BITE - built-in test equipment
* cont - controller
* CPC - cabin pressure controller
* E/E - electronic equipment
* ELACT - electronic actuator
* ESDS - electro-static discharge sensitive
* flt alt - flight altitude
* ft - foot/feet
* fwd - forward
* ISA - international standard atmosphere
* land alt - landing altitude
* man - manual
* press - pressure
* PSEU - proximity switch electronic unit
* PSI - pounds per square inch
* PSID - pounds per square inch differential
* ref - reference
* sched - schedule
* SLFPM - sea level feet per minute
* SMYDC - stall management yaw damper computer
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General Description
The air conditioning packs force air into the airplane pressure
vessel (cabin). Pressurization control maintains a safe cabin
altitude. Pressurization control has these three sub-systems:
* Cabin pressure control
* Cabin pressure relief
* Cabin pressure indication and warning.
Cabin Pressure Control System
The cabin pressure control system controls the rate that the air
flows out of the cabin. These are the components of the cabin
pressure control system:
* Cabin pressure control module
* Two digital cabin pressure controllers (CPC)
* Outflow valve
* Overboard exhaust valve.
Cabin Pressure Relief System
The cabin pressure relief system is a fail safe system. It protects
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