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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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Quick Links

06/25/19

Message Overview:

Fault Message:

GCU1/ACPC/XFER INH SENS FAULT/SMOKE

Fault Code:

2421130LPS

Associated CAS:

GEN 1 FAIL
(Advisory)

Reporting LRU: Generator Control Unit (GCU) 1
System Description: 24-21-00
Schematic Diagram: 24-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-21-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Generator Control Unit (GCU) 1 has received a Generator Line Contactor (GLC) Inhibit (GLC INH) signal from the AC Power Center (ACPC) or has detected a failure in its internal GLC inhibit sensing circuit.

Possible Causes:

  • Generator Control Unit (GCU) 1 (A56)
  • AC Power Center (ACPC) (A54)
  • 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 GCU 1 with GCU 2 (physically or using the GCU patch cable).
    NOTE: Use PMAT to monitor the fault on GCU.

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

  2. Remove PLC 1. Is the fault still present?

    1. If NO, install a new PLC in the 1 position and do close out.
    2. If YES, re-install PLC 1 and continue with next step.

  3. Remove PLC 2. Is the fault still present?

    1. If NO, install a new PLC in the 2 position and do close out.
    2. If YES, re-install PLC 2 and continue with next step.

  4. Remove PLC 3. Is the fault still present?

    1. If NO, install a new PLC in the 2 position and do close out.
    2. If YES, re-install PLC 2 and continue with next step.

  5. Remove PLC 1, PLC 2, PLC 3 and carry out a wiring checks on GCU 1. Disconnect GCU 1 connector A56P2 and using a multimeter, check for a ground short fault on A56P2-29.

    1. If a ground short fault is not detected, go to step 7.
    2. If a ground short fault is detected, continue with next step.

  6. On ACPC, disconnect connector A54P6. On connector A56P2, using a multimeter, check for a ground short fault on A56P2-29.

    1. If the ground short fault is no longer present, go to step 7.
    2. If the ground short fault is still present, repair or replace the wire harness between GCU 1 and the ACPC and do close out.

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

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