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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:

GEN1 SHORTED PMG FAULT

Fault Code:

2421191LPS

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:

A phase to phase short circuit on Variable Frequency Generator (VFG) 1 Permanent Magnet Generator has been detected by Generator Control Unit (GCU) continuous monitoring built-in test.

Possible Causes:

  • Variable Frequency Generator (VFG) 1 (G1)
  • Generator Control Unit (GCU) 1 (A56)
  • 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 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 #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. Disconnect connector A56P1 (GCU 1) and G1P1 (VFG 1). Perform wiring checks (continuity = failure) between Main Generator and ground as follow:

    From To Result
    G1P1-G Ground
    G1P1-C Ground
    G1P1-L Ground

    1. If there is continuity, repair defective wiring as required and do close out.
    2. If fault remains, continue with next step.

  3. Replace VFG 1.
  4. Do close out.

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