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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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06/28/19

Message Overview:

Fault Message:

GEN3 FIRE TRIP

Fault Code:

2423120LPS

Associated CAS:

GEN 4 FAIL
(Advisory)

Reporting LRU: Generator Control Units (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:

Variable Frequency Generator (VFG) 4 has tripped off-line or will not come on-line due to deliberate operation or failure of the R Fire Handle.

Possible Causes:

  • R Fire Handle (A210)
  • Generator Control Units (GCU) 4 (A59)
  • 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 ]
Operational Test of the Fire Extinguishing System AMM 26-21-00-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Fire Handles AMM 26-21-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Fire Handles AMM 26-21-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Make sure the R Fire Handle is not operated.
  2. Swap the GCU 4 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 4 and do close out.
    2. If fault remains, continue with next step.

  3. Disconnect connector A59P2 (GCU 4) and connector A210P1 (R engine fire handle).
  4. Perform wiring checks (short circuit= failure) between GCU 4 and ground as follow:

    From To Result
    A59P2-20 Ground

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

  5. Do the operational test of the fire extinguishing system.

    1. If test passes, do close out.
    2. If test fails, continue with next step.

  6. Replace R Fire Handle.
  7. Do close out.

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