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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:

DPMS1/LPROT/WIRING FAULT

Message Code:

B3-006656

Associated CAS:

ELECTRICAL FAULT
(Caution)

L GEN FAIL
(Caution)

ELECTRICAL FAULT
(Advisory)

Reporting LRU: DIFF PROT SNSR 1
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 Sensor has detected a current imbalance between the 2 feeders.

A failure with the Left Generator Sensor or Left Protection PCB has been reported by the Left DCPC.

Possible Causes:

  • Left Generator power feeders terminal lugs corroded / Oxidized and / or under torqued at left generator or left DCPC
  • Left Generator Sensor (DPMS1 or MPE071)
  • Left DC Power-Center Protection (LPROT) (PCB1)
  • Left Generator Power Feeders
  • Left DC Power Center (LDCPC) (A35)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-24-0034 - "ELECTRICAL FAULT" CAS Message When External Power is Connected
  • AW300-24-0137 - Y06 Electrical System Upgrade
  • AW300-24-0289 - Generator failures during APU start

    • 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 DC Power Center (DCPC) AMM 24-61-01-000-801
    Installation of the DC Power Center (DCPC) AMM 24-61-01-400-801
    Removal of the Generator Sensor AMM 24-61-41-000-801
    Installation of the Generator Sensor AMM 24-61-41-400-801
    Removal of the DC Power-Center Protection AMM 24-61-77-000-801
    Installation of the DC Power-Center Protection AMM 24-61-77-400-801
    Generator Load test Procedure RIL BD-0069
    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. Do visual inspection of the feeder cables between the left Generator G1 positive terminal block and the left DC Power-Center T11 and T12 Studs.

      1. If inspection is satisfying, continue with next step.
      2. If inspection and wiring check are not satisfying, repair/replace defective wiring.

    2. Make sure the left Generator power feeder cables terminal lugs are free of any corrosion / oxidation at left DC Power-Center T11 and T12 Studs and left generator positive terminal stud.

      1. If inspection is satisfying, continue with next step.
      2. If inspection is not satisfying, clean affected terminal lugs as per best shop practices.

    3. Make sure the left generator positive stud hardware stack up is installed and torqued as per AMM's generator installation task 24-31-05-400-801.

      1. If inspection is satisfying, continue with next step.
      2. If inspection is not satisfying, reinstall the left generator positive terminal stud hardware stack up as per AMM's generator installation task

    4. Make sure the left DC Power-Center terminal studs T11 and T12 hardware is installed and torqued as per AMM TASK 24-61-77-400-801

      1. If inspection is satisfying, continue with next step.
      2. If inspection is not satisfying, torque the left DC Power-Center studs T11 and T12 hardware as per specs.
        NOTE: At the operator's discretion, a Generator Load Test can be performed to ensure the generator functionality under heavy output load. Refer to RIL BD-0069.

    5. Disconnect the left Generator Sensor (DPMS1) connector. 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.

    6. Swap the left Generator Sensor (DPMS1) with the Right Generator Sensor (DPMS2). Is the fault message still present?

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

    7. Swap the left DC Power-Center Protection (PCB1) with the right Power-Center Protection (PCB2). Is the fault message still present?

      1. If YES, continue with next step.
      2. If NO, replace the defective DC Power-Center Protection.

    8. Replace the left DC Power-Center (A35).
    9. Do close out.

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