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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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Quick Links

06/20/19

Message Overview:

Fault Message:

APU GEN SHORTED PMG FAULT

Fault Code:

2420191LPS

Associated CAS:

APU GEN FAIL
(Advisory)

Reporting LRU: Auxiliary Power Unit Generator Control Unit (APU GCU)
System Description: 24-22-00
Schematic Diagram: 24-22-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-22-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

A phase to phase short circuit on Auxiliary Power Unit (APU) Generator and Permanent Magnet Generator has been detected by Generator Control Unit (GCU) continuous monitoring build test.

Possible Causes:

  • Auxiliary Power Unit Generator Control Unit (APU GCU) (A109)
  • Auxiliary Power Unit (APU) Generator (A110)
  • 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 the GCU 1, the GCU 4 and the APU GCU into position 2 or 3 (for troubleshooting only). You can monitor the GCU fault in CAIMS via the active faults page.

Quick Links:

Removal of the APU Generator AMM 24-22-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the APU Generator AMM 24-22-01-400-801 [ 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 the APU GCU with the GCU#2 (physically or using the GCU patch cable).

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

  2. Disconnect connector APU GCU (A109P1) and APU GEN (A110P1).
  3. Perform wiring checks (short circuit = failure) between APU GCU.

    From To Result
    A110P1-C Ground
    A110P1-G Ground
    A110P1-L Ground

    1. If wiring checks are good, repair defective wiring as required and do close out.
    2. If fault remains, continue with next step.

  4. Replace APU Generator.
  5. Do close out.

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