787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Engines, APU -
APU System Description
Copyright © The Boeing Company. See title page for details.
7.30.4 D615Z003-TBC
There is no cooldown period when the APU is manually shut down after the APU
LIMIT message is displayed.
APU Unattended Mode
In the unattended mode, any of the following faults cause the APU to shutdown
immediately:
• APU fire/inlet overtemperature
• overspeed/loss of overspeed protection
• high EGT/loss of EGT signal
• low oil pressure
• high oil temperature
• APU starter/generator oil filter approaching bypass
• Air inlet door failed closed
• APU controller failure
• speed droop
• APU starting failure (no rotation, or no acceleration, or no light-off)
There is no cool down period. The EICAS advisory message, APU SHUTDOWN,
displays.
February 13, 2009
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