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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 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：庞巴迪挑战者604机组操作手册 CL_604-AUXILIARY_POWER_UNIT
