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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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05/06/21

Message Overview:

Message Name:

FAULT

Message Code:

B3-007676

Associated CAS:

APU GEN FAIL
(Caution)

ELECTRICAL FAULT
(Caution)

ELECTRICAL FAULT
(Advisory)

Reporting LRU: R APU GEN CNTOR1
System Description: 24-31-00
24-64-00
Schematic Diagram: 24-31-10
24-61-00
Wiring Diagram: 24-31-09

Message Description:

The Right APU Generator Contactor 1 (RAPC1) has failed.

Possible Causes:

  • Right APU Generator Contactor (RAPC1) (K72)
  • Auxiliary Power Center Primary Logic (ALOG) (PCB11)
  • Auxiliary Power Center (Aux DCPC) (A196)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Auxiliary Power Center (Aux DCPC) AMM 24-64-01-000-801
Installation of the Auxiliary Power Center (Aux DCPC) AMM 24-64-01-400-801
Removal of the Auxiliary DC Power Contactor AMM 24-64-05-000-801
Installation of the Auxiliary DC Power Contactor AMM 24-64-05-400-801
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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Disconnect the Right Auxiliary DC Power Contactor K72 (RAPC1) connector located in the AUX DCPC (A196). Do visual inspection of the connector and associated wiring for any loose pins and/or damaged wire.

    1. If inspection is satisfying, continue with next step.
    2. If inspection is not satisfying, go to step 5.

  2. Verify Right Auxiliary DC Power Contactor K72 (RAPC1) coils by measuring the resistances at the contactor connector as per the following table:

    Coils Expected Values Results
    (Pick-up) Pin 1 and Pin 2 between 4.5 Ω and 6.5 Ω
    (Hold) Pin 2 and Pin 3 between 260 Ω and 280 Ω

    1. If the verification is satisfying, continue with next step.
    2. If the verification is not satisfying, replace the defective Auxiliary DC Power Contactor.
      NOTE: It is important to not skip this verification before proceeding with the interchange at step 3. A short of one of the 2 coils will result with a blowing of a fuse on the Auxiliary Power Center Primary Logic PC11.

  3. Interchange the Right Auxiliary DC Power Contactor K72 (RAPC1) with the Left Auxiliary DC Power Contactor K71 (LAPC1). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective Auxiliary DC Power Contactor.

  4. Replace the Auxiliary Power Center Primary Logic PC11. Is the fault message still present?

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

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

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