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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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09/21/20

Message Overview:

Fault Message:

GCU1 [GLC DRIVE OPEN/SHORT/STATUS]

Fault Code:

2421133LPS

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 Line Contactor (GLC) 1 is detected faulty by the Generator Control Unit (GCU) 1.

Possible Causes:

  • Generator Control Unit (GCU) 1 (A56)
  • Contactor (K5)
  • AC Power Center (ACPC) (A54)
  • TB601
  • TB101
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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) L-Series Contactors AMM 24-51-33-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) L-Series Contactors AMM 24-51-33-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]
AC Power Center Component Maintenance Manual CMM 24-51-02 [ 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. Swap Contactors K5 with K7.

    1. If system checks are good, replace K5 and do close out.
    2. If fault remains, continue with next step.

  3. Perform wiring check between ACPC and GCU 1.

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

  4. Perform wiring check between TB101, TB601 and P103 in ACPC.

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

  5. Replace ACPC.
  6. Do close out.

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