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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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01/20/25

Message Overview:

Message Name:

FAULT

Message Code:

B3-226910

Associated CAS:

APU GEN FAIL
(Caution)

ELECTRICAL FAULT
(Caution)

ELECTRICAL FAULT
(Advisory)

Reporting LRU: R APU GEN CNTOR2
System Description: 24-31-00 - Primary DC Power System
24-64-00 - Auxiliary DC Power Center
Schematic Diagram: 24-31-10 - Auxiliary DC-Power System
24-61-00  - DC Power Center (DCPC) System
Wiring Diagram: 24-31-09 - APU Generator - ALL
24-64-01 - Auxiliary DC Power Center (Aux DCPC) -ALL

Message Description:

The Right APU Generator Contactor 2 (RAPC2) has failed.

Possible Causes:

  • Right Auxiliary DC Power Contactor (RAPC2) (K148)
  • Auxiliary Power Center Primary Logic (ALOG) (PCB11)
  • Auxiliary Power Center (Aux DCPC) (A196)
  • Right DC Power Center (R DCPC) (A36)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

Standard Aircraft Configuration for Maintenance AMM 12-00-00-867-803
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801
Electrostatic-Discharge Safety Precautions AMM 24-00-00-910-802
Connect Electrical Power to the Aircraft AMM 24-00-00-861-801
Remove the Electrical Power from the Aircraft AMM 24-00-00-861-802
Removal of the DC Power Center (DCPC) AMM 24-61-01-000-801
Installation of the DC Power Center (DCPC) AMM 24-61-01-400-801
Functional Test of the DC Power Center (DCPC) AMM 24-61-01-720-801
Removal of the Auxiliary Power Contactor AMM 24-61-13-000-801
Installation of the Auxiliary Power Contactor AMM 24-61-13-400-801
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
Operational Test of the Auxiliary DC Power Center (Aux DCPC) AMM 24-64-01-710-801
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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Disconnect the Right Auxiliary DC Power Contactor K148 (RAPC2) connector located in the R DCPC. 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 8.

  2. Do wiring check of the following wire:

    From To Results
    AUX DCPC conn. A196P2 - pin g R DCPC conn. A36P5 - pin g
    AUX DCPC conn. A196P2 - pin E R DCPC conn. A36P5 - pin E
    AUX DCPC conn. A196P2 - pin F R DCPC conn. A36P5 - pin F
    AUX DCPC conn. A196P2 - pin B R DCPC conn. A36P5 - pin B

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

  3. Do wiring check of the following wire:

    From To Results
    R DCPC conn. A36J5 - pin g K148 conn (P-side) - pin 6
    R DCPC conn. A36J5 - pin E K148 conn (P-side) - pin 1
    R DCPC conn. A36J5 - pin F K148 conn (P-side) - pin 3
    R DCPC conn. A36J5 - pin B K148 conn (P-side) - pin 2

    1. If wiring check is satisfying, continue with next step.
    2. If wiring check is not satisfying, go to step 8.

  4. Verify Right Auxiliary DC Power Contactor K148 (RAPC2) coils by measuring the resistances at the contactor connector (P-side) as per the following table:

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

    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 5. A short of one of the 2 coils will result with a blowing of a fuse on the Auxiliary Power Center Primary Logic PC11.

  5. Interchange the Right Auxiliary DC Power Contactor K148 (RAPC2) with the Left Auxiliary DC Power Contactor K149 (LAPC2). Is the fault message still present?

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

  6. 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.

  7. Replace the Aux DCPC. Is the fault message still present?

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

  8. Replace the Right DCPC.
  9. Do close out.

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