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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-002
Component Locations
The air conditioning cooling system components are in these
areas of the airplane:
* Flight compartment
* EE compartment
* Distribution compartment
* Air conditioning compartment and wing-to-body fairing.
Flight Compartment
The air conditioning panel is on the P5 overhead panel.
EE Compartment
The air conditioning accessory unit (ACAU) is on the E4-1 shelf.
Distribution Compartment
The conditioned air check valve is in the distribution
compartment.
Air Conditioning Compartment and Wing-to-Body Fairing
The air conditioning pack systems are in the air conditioning
compartments. The ram air system is in the wing-to-body
fairing. This is the area forward and outboard of the air
conditioning compartment.
AIR CONDITIONING - COOLING - COMPONENT LOCATION
EFFECTIVITY
GUN 101-118 21-50-00
Page 8
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-004
AIR CONDITIONING - COOLING - COMPONENT LOCATION
AIR CONDITIONING - COOLING - COMPONENT LOCATION
EFFECTIVITY
GUN 101-118 21-50-00
Page 9
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-004
Purpose
The air conditioning accessory unit (ACAU) is the interface of
the airplane operational logic and the air systems.
Location
The ACAU is in the EE compartment on the E4-1 shelf.
Interfaces
The air conditioning accessory unit has an interface with these
systems:
* Flight controls (flaps not up switch)
* Landing gear (air/ground)
* Engine starting
* Air conditioning
* Pneumatic/bleed air
* Flight management computer (FMC).
The ACAU receives signals from these airplane components:
* Engine start valves
* Flap control unit
* Air/Gnd relays
* Pack flow control and shutoff valve
* Ram air actuator/controllers
* Pack overheat switches
* Air mix valves
* Cabin temperature controller
* Engine bleed switches
* Duct overheat switches
* Pneumatic system valves
* Air Conditioning / Bleed Air Controls Panel
* Cabin Temperature Panel
* Pressurization outflow valve
* Recirculation fan
* Overboard exhaust valve
* Pneumatic system ovht/ovpress switches
* FMC.
The ACAU sends signals to these components:
* Air Conditioning / Bleed Air Controls Panel
* Cabin Temperature Panel
* Bleed air regulators
* Eng start valves
* Pack flow control and shutoff valves
* Ram air inlet controllers
* Ram air inlet actuators
* Cabin temperature controller
* Air mix valves
* Outflow valve
* Recirculation fan
* EE cooling fans
* FMC.
Training Information Point
You must do an adjustment/test after you replace the ACAU.
AIR CONDITIONING - COOLING - AIR CONDITIONING ACCESSORY UNIT
EFFECTIVITY
GUN 101-118 21-50-00
Page 10
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-009
AIR CONDITIONING - COOLING - AIR CONDITIONING ACCESSORY UNIT
AIR CONDITIONING - COOLING - AIR CONDITIONING ACCESSORY UNIT
EFFECTIVITY
GUN 101-118 21-50-00
Page 11
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-009
Purpose
The flow control and shutoff valve controls the air flow to the
pack.
Location
The flow control and shutoff valve is in the air conditioning
compartment. It is adjacent to the keel beam and air cycle
machine.
Physical Description
The flow control and shutoff valve is electrically controlled and
pneumatically actuated. It is spring-loaded to the closed
position. These are the parts of the flow control and shutoff
valve:
* Butterfly plate
* Visual position indicator
* Actuator
* Auto flow servo
* Venturi
* Cabin pressure sense port
* Solenoid A (APU/high flow)
* Solenoid B (auto flow)
* Solenoid C (open-close)
* APU/High flow servo.
It has four electrical connections and one cabin pressure sense
line connection.
Training Information Point
The position indicator lets you examine the valve for trouble
shooting.
AIR CONDITIONING - COOLING - FLOW CONTROL AND SHUTOFF VALVE
　
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