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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

06/28/19

Message Overview:

Fault Message:

GCU4/ACPC/XFER INH SENS FAULT/SMOKE

Fault Code:

2424130LPS

Associated CAS:

GEN 4 FAIL
(Advisory)

Reporting LRU: Generator Control Unit (GCU) 4
System Description: 24-21-00
Schematic Diagram: 24-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-21-04 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Generator Control Unit (GCU) 4 has received a Generator Line Contactor Inhibit (GLC INH) signal from the AC Power Center (ACPC) or has detected a failure in its internal GLC inhibit sensing circuit.

Possible Causes:

  • AC Power Center (ACPC) (A54)
  • Generator Control Unit (GCU) 4 (A59)
  • Primary Logic Card (PLC) 1
  • Primary Logic Card (PLC) 2
  • Primary Logic Card (PLC) 3
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

A GCU patch cable (GSE REF # 24X-24-02) can be used to swap GCUs 1, 4 and 5 into position 2 or 3 (for troubleshooting only).

The GCU NVMs can only be downloaded at position #2 or #3.

Quick Links:

Removal of the Generator Control Units (GCU) AMM 24-24-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Generator Control Units (GCU) AMM 24-24-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC) AMM 24-51-00-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) AMM 24-51-00-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC) Primary Logic AMM 24-51-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Primary Logic AMM 24-51-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap the GCU 4 with GCU 2.

    1. If system checks are good, replace GCU 4 and do close out.
    2. If fault remains, continue with next step.

  2. Remove PLC 1.

    1. If fault is no longer present, install a new PLC in the 1 position and do close out.
    2. If fault is still present, re-install PLC 1 and go to next step.

  3. Remove PLC 2.

    1. If fault is no longer present, install a new PLC in the 2 position and do close out.
    2. If fault is still present, re-install PLC 2 and go to next step.

  4. Remove PLC 3.

    1. If fault is no longer present, install a new PLC in the 3 position and do close out.
    2. If fault is still present, re-install PLC 3 and go to next step.

  5. Remove PLC 1, PLC 2 and PLC 3.
  6. On GCU 4, disconnect connector A59P2, using a multi-meter, perform wiring checks (ground short fault) between A59P2 and ground as follow:

    From To Result
    A59P2-29 Ground

    1. If the ground short fault is no longer present, repair defective wiring as required and do close out.
    2. If the ground short fault is detected, continue with next step.

  7. On ACPC, disconnect connector A54P2, using a multi-meter, perform wiring checks (ground short fault) between A54P2 and ground as follow:

    From To Result
    A54P2-29 Ground

    1. If the ground short fault is no longer present, continue with next step.
    2. If the ground short fault is still present, repair or replace the wire harness between GCU 4 and ACPC and do close out.

  8. Replace the ACPC.
  9. Do close out.

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