BOMBARDIER BD-100-1A10, Operating Manual

Page: 189 / 544

AUXILIARY POWER UNIT
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6
05-01-15
EICAS MESSAGES
The APU system messages are displayed on the EICAS.
Inhibits, a brief description, and aural warnings (if applicable) are listed in the table below.
MESSAGE INHIBITS MEANING
AURAL
WARNING
APU FIRE
The APU fire detection loop has activated. On
the ground the system should automatically
shut the APU down and activate the fire extin-
guisher. In flight the APU will not automatically
shut down or activate the fire extinguisher
“APU FIRE”
APU OVERTEMP TO
An APU EGT over temperature has been
detected. On the ground, the APU will auto-
matically shutdown
APU BLEED ALT LIMIT TO/LAND
APU bleed air has been commanded above
20 000 ft or the APU bleed modulated due to
excessive EGT
APU FUEL SOV FAIL TO/LAND The APU shutoff valve has failed
APU OVERSPEED TO/LAND The APU has shutdown due to an overspeed
APU OIL PRESS LOW TO/LAND The APU oil pressure is low while in flight
APU OIL TEMP HIGH TO/LAND The APU oil temperature is high while in flight
APU STARTER FAIL
ON
TO/LAND
Power is still being supplied to the APU starter
when electronic control unit is not command-
ing a start
APU FAULT TO/LAND
A fault is indicated in the APU system. One or
more of the following has occurred:
- The APU bleed valve has failed
- The APU fuel solenoid has failed
- A start is prevented
- The avionics are not communicating with the
APU electronic control unit
- Reverse flow has been detected
APU SHUTDOWN TO/LAND
The auxiliary power unit electronic control unit
has shut down the APU for protective reasons