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operation. The right side of the oil sight gage shows the oil level
for no APU operation (APU shutdown).
The CDU shows the APU oil quantity with a FULL, ADD, or LOW
indication.
Training Information Point
Servicing of the APU should only be done with the APU
shutdown.
AIRBORNE AUXILIARY POWER - APU ACCESS AND SERVICING
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General
The ECU sends and receives data with airplane systems. The
data is digital and analog. The ARINC 429 data bus transmits
the digital data.
ARINC 429 Interfaces
Display electronic unit (DEU) 1 transmits ARINC 429 data to the
ECU.
These components receive ARINC 429 data from the ECU:
* Display electronic unit (DEU) 1
* Display electronic unit (DEU) 2
* Digital flight data acquisition unit (DFDAU).
Other interfaces
The ECU also has analog interfaces with these systems and
components:
* APU switch
* APU bleed switch
* Remote fire switch
* Engine and APU fire control
* Bus power control unit
* Engine and APU fire detection module
* APU generator control unit
* APU fuel shutoff valve
* APU air inlet door actuator
* Air inlet door position switch
* Start converter unit
* Landing gear logic
* Airplane battery
* Air conditioning system (ACS) flow control valves
* Main engine start switches 1 and 2.
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General
The APU cooling air system cools the APU compartment and
the APU engine oil.
Compartment Cooling
APU compartment cooling uses an eductor to pull outside air
through the APU compartment. The high speed flow of the APU
exhaust forms a low pressure area. This low pressure pulls
outside air through the eductor inlet duct to the APU
compartment. The cooling air then goes through the oil cooler
and out the APU exhaust duct.
See the APU oil section for more information on the oil cooler.
(SECTION 49-90)
AIRBORNE AUXILIARY POWER - APU COOLING
EFFECTIVITY
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49-10-00
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Purpose
The APU power plant supplies electrical and pneumatic power
to the airplane systems. This permits the airplane systems to
operate without engine or ground power when necessary.
General
These are the APU power plant systems and components:
* Auxiliary Power Unit
* APU wire harness
* APU mounts
* APU air inlet
* APU drains
* Insulation panels.
See the APU engine section for more information.
(SECTION 49-20)
APU POWER PLANT - INTRODUCTION
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APU POWER PLANT - INTRODUCTION
APU POWER PLANT - INTRODUCTION
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