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AUXILIARY POWER UNIT
CONTROLS AND INDICATIONS (Cont) ELECTRICAL SYNOPTIC PAGE

Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
05-01-12

AUXILIARY POWER UNIT
CONTROL AND INDICATIONS (Cont) ECS SYNOPTIC PAGE
The ECS synoptic page is used to monitor the APU load control valve.

Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
05-01-13

AUXILIARY POWER UNIT
CONTROL AND INDICATIONS (Cont) FUEL SYNOPTIC PAGE
Operation of the APU pump and fuel SOV is monitored on the FUEL synoptic page.

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Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
05-01-14 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 

Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
05-01-15