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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:

B3-226907

Associated CAS:

APU GEN FAIL
(Caution)

ELECTRICAL FAULT
(Caution)

ELECTRICAL FAULT
(Advisory)

Reporting LRU: APU LOGIC PCB
System Description: 24-31-00
24-64-00
49-60-00
Schematic Diagram: 24-31-10
24-61-00
49-61-00
Wiring Diagram: 24-31-09
49-61-01 Sh. 1
49-61-01 Sh. 2

Message Description:

Auxiliary Power Center Primary Logic (PCB11) has failed.

Possible Causes:

  • Auxiliary Power Center Primary Logic (ALOG) (PCB11)
  • Auxiliary Generator Power-Module (AGPM) (PCB10)
  • Auxiliary Generator Control-Unit (AGCU) (PCB9)
  • Auxiliary Power Unit (APU) Electronic Control Unit (ECU) (A39)
  • Auxiliary DC Power Center (AUX DCPC) (A196)
  • APU Generator (G3)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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 Control Unit (GCU) - Primary AMM 24-31-13-000-801
Installation of the Generator Control Unit (GCU) - primary AMM 24-31-13-400-801
Removal of the Auxiliary Generator Control-Unit AMM 24-31-17-000-801
Installation of the Auxiliary Generator Control-Unit AMM 24-31-17-400-801
Removal of the Generator Power Module AMM 24-31-21-000-801
Installation of the Generator Power Module AMM 24-31-21-400-801
Removal of the Auxiliary Generator Power-Module AMM 24-31-25-000-801
Installation of the Auxiliary Generator Power-Module 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
Removal of the Auxiliary Power Center Primary-Logic AMM 24-64-13-000-801
Installation of the Auxiliary Power Center Primary-Logic AMM 24-64-13-400-801
Removal of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-000-801
Installation of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Remove the Auxiliary Generator Power-Module PCB10. Inspect the card and connector. If no damage is found, reinstall the card making sure it is fully and properly inserted into place. Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  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 Auxiliary Generator Power-Module.

  3. Swap the Auxiliary Generator Control-Unit PCB9 with the Right Generator Control Unit PCB6 or the Left Generator Control Unit PCB5. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective Auxiliary Generator Control-Unit.

  4. Do wiring check of the following wires:

    From To Result
    APU ECU conn. A39AP1 - pin 6A AUX DCPC conn. A196P1 - pin L
    APU ECU conn. A39AP1 - pin 7A Ground Stud GS4013
    APU ECU conn. A39BP1 - pin 1B AUX DCPC conn. A196P1 - pin Y
    APU ECU conn. A39BP1 - pin 3B AUX DCPC conn. A196P1 - pin S

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

  5. Do wiring check of the following wires:

    From To Result
    APU GEN conn. G3P1 - pin A AUX DCPC conn. A196P1 - pin G
    APU GEN conn. G3P1 - pin B AUX DCPC conn. A196P1 - pin F
    APU GEN conn. G3P1 - pin D AUX DCPC conn. A196P1 - pin K
    APU GEN conn. G3P1 - pin F AUX DCPC conn. A196P1 - pin h
    APU GEN conn. G3P1 - pin E AUX DCPC conn. A196P1 - pin H
    APU GEN conn. G3P1 - pin G AUX DCPC conn. A196P1 - pin AA
    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 satisfying, continue with next step.
    2. If wiring check is not satisfying, repair the defective wire.

  6. Replace the Auxiliary Power Center Primary Logic PCB11. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  7. Replace the Auxiliary Power Unit (APU) Electronic Control Unit (ECU). Is the fault message still present?

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

  8. Replace the AUX DCPC. Is the fault message still present?

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

  9. Replace the APU Generator.
  10. Do close out.

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