AUXILIARY POWER SYSTEM -APU ACCESS AND SERVICING
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
APU POWER PLANT -INTRODUCTION
General APU Drains
The power plant has these systems and components: The APU drains permit flammable fluid to drain from the APU.
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Auxiliary power unit
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APU mounts
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APU wire harness
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APU air inlet
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APU drains.
Auxiliary Power Unit
The auxiliary power unit contains these major sections:
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Accessory gearbox
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Pneumatic load compressor
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Gas turbine engine.
APU Mounts
The APU mounts hold the APU in the APU compartment and isolate the structure from APU vibration.
APU Wire Harness
The APU wire harness contains all the electrical wiring for the APU.
APU Air Inlet
The APU air inlet supplies the air for the APU engine and APU load compressor operation.
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APU POWER PLANT -INTRODUCTION
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APU POWER PLANT -AUXILIARY POWER UNIT
Clustered Components
Some APU components are in functional clusters to make maintenance easier. These clusters include:
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Lube cluster
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Fuel cluster
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Pneumatic cluster
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Ignition cluster.
Other Components
These are the other main APU components:
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Air turbine starter control valve (ATSCV)
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Fuel manifolds
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Oil cooler
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Data memory module (DMM)
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Air turbine starter (ATS)
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Electric starter motor
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Surge duct.
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APU POWER PLANT -AUXILIARY POWER UNIT
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APU POWER PLANT -APU MOUNTS
Purpose
Three APU mounts hold the APU in its compartment. The mounts also isolate the structure from APU vibration.
Location
The two forward mounts attach to the APU firewall. The aft APU mount hangs from the upper tailcone structure.
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APU POWER PLANT -APU MOUNTS
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APU POWER PLANT -APU WIRE HARNESS
Purpose
The APU wire harness holds all the electrical wires in one assembly.
Location
The APU wire harness extends from the firewall connector to the front of the APU. From the front of the APU it goes in different directions around the APU to connect all electrical components.
Physical Description
Shielded, twisted pair conductors keep electromagnetic interference on circuits to a minimum. APU harness connectors are threaded, stainless steel, and self-locking.
Training Information Point
Wiring routing tags on the harness show pin to pin electrical continuity.
Quick release fastener cable clamps attach the APU harness to the APU.
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APU POWER PLANT -APU WIRE HARNESS
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APU POWER PLANT -AIR INLET -INTRODUCTION
Purpose
The APU air inlet supplies air to the APU for APU engine and load compressor operation, and for oil and APU compartment cooling. These are the APU air inlet components:
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