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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:

APU GEN FIELD -VE TO GROUND FAULT

Fault Code:

2420102LPS

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:

The Auxiliary Power Unit Generator Control Unit (APU GCU) has detected a failure with the field negative to ground circuit and consequently resulting in Auxiliary Power Unit (APU) Generator to tripped off-line or not come on-line. Inhibited during Take-off and Landing.

Possible Causes:

  • Auxiliary Power Unit (APU) Generator (A110)
  • Auxiliary Power Unit Generator Control Unit (APU GCU) (A109)
  • 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 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. The GCU NVMs can only be downloaded at position #2 or #3.

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). Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, replace APU GCU and do close out.

  2. Disconnect connector A109P1 (APU GCU) and A110P1 (APU GEN).
  3. Perform a wiring check as follows:

    From To Result
    A110P1-B Ground

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

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

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