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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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02/25/21

Message Overview:

Message Name:

FAULT

Message Code:

B3-006293

Associated CAS:

APU GEN FAIL
(Caution)

ELECTRICAL FAULT
(Advisory)

Reporting LRU: APU GEN PWR MDL
System Description: 24-31-00
24-64-00
Schematic Diagram: 24-31-10
24-61-00
Wiring Diagram: 24-31-09
24-31-17

Message Description:

Auxiliary Generator Power-Module (PCB10) has failed.

Possible Causes:

  • Generator Control Unit (GCU) Printed Circuit Board 9 (PCB9)
  • Auxiliary Generator Power-Module (AGPM) (PCB10)
  • APU Generator (G3)
  • Auxiliary Power Center (Aux DCPC) (A196)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Main Generator AMM 24-31-05-000-801
Installation of the Main Generator AMM 24-31-05-400-801
Removal of the APU Generator AMM 24-31-09-000-801
Installation of the APU Generator AMM 24-31-09-400-801
Removal of the Generator Power Module (GPM) AMM 24-31-21-000-801
Installation of the Generator Power Module (GPM) AMM 24-31-21-400-801
Removal of the Auxiliary Generator Power-Module (AUX GPM) AMM 24-31-25-000-801
Installation of the Auxiliary Generator Power-Module (AUX GPM) AMM 24-31-25-400-801
Removal of the Auxiliary DC Power Center (Aux DCPC) AMM 24-64-01-000-801
Installation of the Auxiliary DC Power Center (Aux DCPC) AMM 24-64-01-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Swap the GCU PCB9 with either of the engine GCU PCB9. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective GCU PCB9.

  2. Swap the Auxiliary Generator Power-Module PCB10 with the Right Generator Power Module PCB8 or the Left Generator Power Module PCB7. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective Generator Power-Module.

  3. Do wiring check of the following wires:

    From To Results
    APU GEN conn. G3P1 - pin L AUX DCPC conn. A196P1 - pin JJ
    APU GEN conn. G3P1 - pin M AUX DCPC conn. A196P1 - pin z
    APU GEN conn. G3P1 - pin H AUX DCPC conn. A196P1 - pin D
    APU GEN conn. G3P1 - pin J AUX DCPC conn. A196P1 - pin d
    APU GEN conn. G3P1 - pin K AUX DCPC conn. A196P1 - pin E

    1. If wiring check is satisfactory, continue with next step.
    2. If wiring check is not satisfactory, repair the defective wire.

  4. Swap the APU Generator (G3) with one of the Main Generator (G1 or G2). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective Generator.

  5. Replace the AUX DCPC (A196).
  6. Do close out.

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