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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 [GEN CURRENT LIMIT INHIB]

Fault Code:

2421232LPS

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:

The Generator Control Unit (GCU) #1 detects the current limit inhibit discrete for 5 seconds without the logic signal ±15 V supply.

Possible Causes:

  • Generator Control Unit (GCU) 1 (A56)
  • AC Power Center (ACPC) (A54)
  • 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. Perform a continuity check as follows:

    From To Result
    A56P2-46 Ground

    1. If there is no continuity, go to step 3.
    2. If there is continuity, continue with next step.

  2. Swap GCU #1 with GCU #2 (physically or using the GCU patch cable).

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

  3. Remove all 3 PLCs inside the ACPC.
  4. Perform a continuity check as follows:

    From To Result
    A54P6-n Ground

    1. If there is continuity, go to step 6.
    2. If there is no continuity, continue with next step.

  5. Perform wiring checks (shorted to ground= failure) as follow:

    From To Result
    A54P6-n A56P2-46

    1. If wiring checks are not good, repair defective wiring and do close out.
    2. If wiring checks are good, continue with next step.

  6. Replace ACPC.
  7. Do close out.

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