For Training Purposes Only
Sept 04
4-i
P I LOT T R A I N I N G GU I D E
AUXILIARY POWER UNIT
Chapter 4: Auxiliary Power Unit TABLE OF CONTENTS
Page
Introduction .........................................................................................................................4-1
Description ..........................................................................................................................4-2
APU Location and Access.............................................................................................4-2
APU Compartment ........................................................................................................4-2
APU Engine...................................................................................................................4-3
System Schematic ........................................................................................................4-4
Lubrication System........................................................................................................4-4
Oil Pressure ............................................................................................................4-5
Oil Replenishment System......................................................................................4-5
Oil Replenishment System Filling ...........................................................................4-7
Oil Replenishment Panel.........................................................................................4-8
Operation ................................................................................................................4-8
Gravity Oil Fill..........................................................................................................4-9
Fuel Control and Indication ...........................................................................................4-9
Airframe Fuel...........................................................................................................4-9
Ignition................................................................................................................... 4-11
Start System.......................................................................................................... 4-11
Speed Indication ................................................................................................... 4-11
Temperature Indication ......................................................................................... 4-11
Hourmeter/Cycle Counter ..................................................................................... 4-12
FADEC Component Control Schematic ...................................................................... 4-12
Control System...................................................................................................... 4-12
Pneumatic ............................................................................................................. 4-13
APU Control Panel ...................................................................................................... 4-14
Start Sequence ........................................................................................................... 4-14
APU Door Positioning ........................................................................................... 4-15
Door Operation...................................................................................................... 4-15
EICAS Display............................................................................................................. 4-15
Door Indication ...................................................................................................... 4-15
APU Fire Protection .................................................................................................... 4-16
APU Loading ......................................................................................................... 4-17
APU Shutdown...................................................................................................... 4-17
APU RPM and EGT Indications .................................................................................. 4-18
Emergency Shutdown................................................................................................. 4-18
External Services Panel .............................................................................................. 4-19
Restart After Emergency Shutdown............................................................................ 4-19
Protective Shutdowns ................................................................................................. 4-20
System Overview Schematic ...................................................................................... 4-21
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