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* Elevator cable housing
* Inlet liner plenum
* Inlet adapter.
Interface
The APU switch and the APU electronic control unit (ECU)
control the air inlet door operation.
Training Information Point
The air inlet door actuator for the 737-600/700/800 is different
than the inlet door actuator for the 737-100/200/300/400/500.
These actuators are not inter-changeable.
APU POWER PLANT - APU AIR INLET - INTRODUCTION
EFFECTIVITY
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APU POWER PLANT - APU AIR INLET - INTRODUCTION
APU POWER PLANT - APU AIR INLET - INTRODUCTION
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Purpose
The air inlet door opens to let air into the engine and load
compressor. The air inlet door closes at shutdown.
The air inlet door is on the right forward side of the aft fuselage.
Air Inlet Door Actuator
The air inlet door actuator is a rotary electric actuator that
opens and closes the air inlet door. The air inlet door actuator is
on the inboard side of the inlet door housing forward of the APU
compartment.
Air Inlet Door Switch
The air inlet door switch supplies a door open and door not
open signal to the ECU. The switch is on the inboard side of the
inlet door housing.
Training Information Point
You can open the air inlet door without a start cycle on the APU.
To open the door, put the APU switch to the ON position.
The air inlet door does not fully close. This prevents APU
rotation during flight when the APU air inlet door is in the closed
position.
The air inlet door and actuator are adjustable.
APU POWER PLANT - AIR INLET DOOR COMPONENTS
EFFECTIVITY
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APU POWER PLANT - AIR INLET DOOR COMPONENTS
APU POWER PLANT - AIR INLET DOOR COMPONENTS
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General
The APU air inlet door opens for APU operations. It is in the
closed position when the APU is not in operation. The ECU and
APU switch control the APU air inlet door.
APU Start
When you put the APU switch in the ON or START position, this
sequence occurs:
* ECU sends an open signal to the fuel shutoff valve
* When the fuel shutoff valve opens, the fuel shutoff valve open
limit switch changes position
* Open signal goes to the ECU
* ECU sends the open signal to the air inlet door actuator
* Air inlet door actuator opens the air inlet door
* When the air inlet door is fully open, the air inlet door switch
sends a signal to the ECU.
Normal Operation
During normal operation, the air inlet door and fuel shutoff valve
stay open until they get a signal to go to the closed position.
APU Shutdown
When you put the APU switch to the OFF position, it causes
these conditions:
* APU shuts down
* APU fuel shutoff valve closes
* APU air inlet door closes.
These signals shutdown the APU and close the air inlet door
and the fuel shutoff valve:
* APU switch to the OFF position (P5)
* APU fire switch in close position (P8)
* APU remote fire switch in close position (P28)
* Engine/APU fire detection module detects a fire
* Automatic protective shutdown (ECU logic).
APU POWER PLANT - APU AIR INLET FUNCTIONAL DESCRIPTION
EFFECTIVITY
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APU POWER PLANT - APU AIR INLET FUNCTIONAL DESCRIPTION
APU POWER PLANT - APU AIR INLET FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The APU engine drain system drains flammable fluid overboard
through a drain mast.
The APU compartment drain system drains flammable and
　
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