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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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01/25/21

Message Overview:

APU FIRE DET FAIL
(Caution)

DDG Reference: 26-13-00
Pilot Action (QRH): SMK 14-9
System Description: 26-13-00
Schematic Diagram: 26-13-00
Wiring Diagram: 26-13-01

Message Description:

The amber 'APU FIRE DET FAIL' caution CAS message indicates the APU fire detection system has determined a failure that will not allow the detection system to indicate a fire.

  • During normal operation and stand-by modes the FIREX-CU performs a fire/overheat periodic BIT once every five (5) minutes. A periodic BIT consists of the following:

    1. Test detector loop open circuits.
    2. Test detector loop fire/overheat detection capability - specifically continuity of each loop's center wire.
    3. Test detector loop monitoring and short circuit detection circuitry - only if a loop fails the fire test.
    4. Test fire & overheat warning discrete output drivers.

    If one of these steps fail for the APU system, the amber APU FIRE DET FAIL will be displayed.

Possible Causes:

  • None

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