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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:

B3-007089

Associated CAS:

ELECTRICAL FAULT
(Caution)

L GEN FAIL
(Caution)

Reporting LRU: L GEN LINE CNTOR
System Description: 24-31-00
24-61-00
Schematic Diagram: 24-31-00
24-61-00
Wiring Diagram: 24-31-05
24-61-01

Message Description:

The Left Generator Line Contactor (LGLC) has failed.

Possible Causes:

  • Left Generator Line Contactor (LGLC) (K69)
  • Left Generator Control Unit (GCU) - Primary (LGCU) (PCB5)
  • Left DC Power Center (LDCPC) (A35)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of Generator Control Unit (GCU) - Primary AMM 24-31-13-000-801
Installation of Generator Control Unit (GCU) - Primary AMM 24-31-13-400-801
Removal of DC Power Center (DCPC) AMM 24-61-01-000-801
Installation of DC Power Center (DCPC) AMM 24-61-01-400-801
Removal of the Generator Line Contactor AMM 24-61-09-000-801
Installation of the Generator Line Contactor AMM 24-61-09-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Disconnect the Left Generator Line Contactor (K69) connector located in the Left DC Power Center (A35). 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 Left Generator Line Contactor (K69) coils by measuring the resistances at the contactor connector (J-side) as per the following table:

    Coils Expected Values Results
    Pin 1 and Pin 2 (Pick-up) between 4.5 Ω and 6.5 Ω
    Pin 2 and Pin 3 (Hold) 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 Generator Line 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 corresponding Generator Control Unit.

  3. Interchange the Left Generator Line Contactor (K69) with the Right Generator Line Contactor (K70). Is the fault message still present?

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

  4. Interchange the Left Generator Control Unit (PCB5) with the Right Generator Control Unit (PCB6). Is the fault message still present?

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

  5. Replace Left DC Power Center (A35).
  6. Do close out.

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