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CABLE THAT IS NOT EQUALLY WOUND CAN
CAUSE THE APU TO FALL SUDDENLY. THIS CAN
CAUSE DAMAGE TO THE APU.
CAUTION: BE CAREFUL WHEN YOU MOVE THE APU IN THE
APU COMPARTMENT. YOU MUST TILT THE APU
APPROXIMATELY 10-15 DEGREES IN THE
FORWARD-END-DOWN POSITION WHILE THE
APU IS IN THE APU COMPARTMENT. DAMAGE
TO THE FUEL SUPPLY LINE, STARTERGENERATOR
WIRE HARNESS AND ENGINE WIRE
HARNESS CAN OCCUR.
CAUTION: CAREFULLY LIFT THE APU SO THAT YOU DO NOT
DAMAGE THE CONED SURFACES OF THE APU
MOUNTS.
APU POWER PLANT - INSTALLATION
EFFECTIVITY
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APU POWER PLANT - INSTALLATION
APU POWER PLANT - INSTALLATION
EFFECTIVITY
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Purpose
The APU engine supplies power to operate the load
compressor and the APU starter-generator.
General Description
The APU engine has these main sections:
* Accessory gear box
* Single stage load compressor
* Single stage engine compressor
* Combustor chamber
* Two stage axial flow turbine.
All the components in the engine that turn are on a common
shaft.
The shaft turns the accessory gearbox and the load
compressor. The accessory gear box turns the APU generator
and other components.
The engine operates at a constant speed to provide 400 Hz
generator output. The APU engine also supplies air for airplane
systems.
An inlet screen prevents foreign object damage (FOD) to the
APU compressors.
APU ENGINE - INTRODUCTION
EFFECTIVITY
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APU ENGINE - INTRODUCTION
APU ENGINE - INTRODUCTION
EFFECTIVITY
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Boroscope Inspection Ports
These components have boroscope inspection access:
* Load compressor
* Engine compressor
* Combustor chamber
* Turbine section.
Engine Manual Rotation
To boroscope the compressor and turbine, you turn the APU
engine main shaft. To do this, remove the access plug in the airoil
separator housing on the front of the gearbox and insert a 1/
4-inch hex drive with a 6-inch extension.
APU ENGINE - TRAINING INFORMATION POINT - APU BORESCOPE
EFFECTIVITY
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APU ENGINE - TRAINING INFORMATION POINT - APU BORESCOPE
APU ENGINE - TRAINING INFORMATION POINT - APU BORESCOPE
EFFECTIVITY
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Purpose
The APU fuel system pressurizes and supplies metered fuel to
the APU combustion chamber. It also supplies pressurized fuel
to the APU inlet guide vane and surge control valve actuators.
These are the APU fuel system components:
* Fuel control unit (FCU)
* Flow divider solenoid
* Flow divider
* Primary fuel manifold
* Secondary fuel manifold
* Fuel nozzles.
APU FUEL SYSTEM - INTRODUCTION
EFFECTIVITY
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APU FUEL SYSTEM - INTRODUCTION
APU FUEL SYSTEM - INTRODUCTION
　
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