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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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03/19/20

Message Overview:

Fault Message:

GEN4 FIELD -VE TO GROUND FAULT

Fault Code:

2424102LPS

Associated CAS:

GEN 4 FAIL
(Advisory)

Reporting LRU: Variable Frequency Generator (VFG) 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. There is a short circuit to ground at the field negative of the No. 4 main generator.

Possible Causes:

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

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE: 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 ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap 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.

  2. Disconnect connector GCU 4 (A59P1) and VFG 4 (G4P1). Perform wiring checks (continuity= failure) as follow:

    From To Result
    G4P1-B 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.

  3. Replace VFG 4.
    NOTE: Check G4J1-B (VFG side) is shorted to ground to confirm VFG/connector failure.
  4. Do close out.

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