Table of Contents
For Training Purposes Only
Sept 04
5-i
P I LOT T R A I N I N G GU I D E AUXILIARY POWER UNIT
Introduction .........................................................................................................................5-1
APU Enclosure..............................................................................................................5-1
Power Section and Accessory Gearbox .............................................................................5-2
Description ....................................................................................................................5-2
Components and Operation..........................................................................................5-2
Power Section .........................................................................................................5-2
Gearbox ..................................................................................................................5-2
Lubrication System..................................................................................................5-2
Generator Adapter ..............................................................................................................5-4
Description ....................................................................................................................5-4
Components and Operation..........................................................................................5-4
Lubrication System..................................................................................................5-4
Electrical Generator ................................................................................................5-4
Air Intake and Exhaust........................................................................................................5-6
Description ....................................................................................................................5-6
Components and Operation..........................................................................................5-6
Air Intake .................................................................................................................5-6
Exhaust ...................................................................................................................5-6
EGT Indications.......................................................................................................5-6
APU Fuel Distribution System.............................................................................................5-8
Description ....................................................................................................................5-8
Components and Operation..........................................................................................5-8
APU Fuel Pump ......................................................................................................5-8
APU Fuel Shutoff Valve ..........................................................................................5-8
APU Negative-G Shutoff Valve ...............................................................................5-9
APU Fuel Control Unit (FCU) ..................................................................................5-9
Start and Ignition............................................................................................................... 5-11
Description .................................................................................................................. 5-11
Components and Operation........................................................................................ 5-11
APU Battery .......................................................................................................... 5-11
Electronic Control Unit (ECU) ............................................................................... 5-11
APU Starter ........................................................................................................... 5-11
Ignition System...................................................................................................... 5-11
Operating Sequences ................................................................................................. 5-12
Start Sequence ..................................................................................................... 5-12
Shutdown Sequence ............................................................................................. 5-12
Protective Shutdowns ........................................................................................... 5-13
AUXILIARY POWER UNIT
5-ii For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Pneumatic Supply ............................................................................................................. 5-14
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