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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

06/27/19

Message Overview:

Fault Message:

GCU4 [OPEN CIRCUIT TR4]

Fault Code:

2424106LPS

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 detected a failure (open circuit) associated with Transistor (TR 4), consequently resulting in Generator 4 to trip off-line or not come on-line.

Possible Causes:

  • Generator Control Unit (GCU) 4 (A59)
  • Variable Frequency Generator (VFG) 4 (G4)

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 Variable Frequency Generators (VFG) AMM 24-21-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Variable Frequency Generators (VFG) AMM 24-21-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
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 ]

Troubleshooting Recommendations:

  1. Perform a complete aircraft power reset. Is the fault still present?

    1. If NO, monitor for failure and do close out.
    2. If YES, continue with next step.

  2. Swap GCU 4 with GCU 3 (Physically or using the GCU patch cable).

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

  3. Replace VFG 4.
  4. Do close out.

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