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(WARNING)
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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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06/20/19

Message Overview:

Fault Message:

APUGEN ROTOR DIODE FAILURE

Fault Code:

2420199LPS

Associated CAS:

None

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:

Auxiliary Power Unit Generator Control Unit (APU GCU) has detected a Rotor Diode in the APU GEN has failed or there is defective circuitry in the APU GCU, consequently resulting in APU Generator tripped off-line or not come on-line.

Possible Causes:

  • Auxiliary Power Unit Generator Control Unit (APU GCU) (A109)
  • Auxiliary Power Unit (APU) Generator (A110)

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 GCU 1, GCU 2, GCU 3, GCU 4 and the APU GCU into a different position (for troubleshooting only). You can monitor the GCU faults 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 ]

Troubleshooting Recommendations:

  1. Swap the APU GCU with GCU 2 (physically or using the GCU patch cable). Is the fault still present?

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

  2. Replace APU Generator.
  3. Do close out.

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