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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

06/14/19

Message Overview:

Fault Message:

APU GEN/READY/FADEC FAULT

Fault Code:

2420110LPS

Associated CAS:

APU GEN FAIL
(Advisory)

Reporting LRU: Auxiliary Power Unit (APU) Generator
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:

CAIMS message posted normally if APU is running normally and the Auxiliary Power Unit (APU) Generator will not come on-line or has tripped off-line. 'APU GEN FAIL' CAS message will also be posted.

Possible Causes:

  • Auxiliary Power Unit (APU) Variable Frequency Generator (VFG)
  • Auxiliary Power Unit (APU) Generator Control Unit (GCU) (A109)
  • Auxiliary Power Unit (APU) Full Authority Digital Engine Controller (FADEC) (A108)
  • AC Power Center (ACPC) (A54)
  • AC Power Center (ACPC) Primary Logic Card (PLC) 1
  • AC Power Center (ACPC) Primary Logic Card (PLC) 2
  • AC Power Center (ACPC) Primary Logic Card (PLC) 3
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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 ]
Removal of the AC Power Center (ACPC) AMM 24-51-00-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) AMM 24-51-00-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC) Primary Logic AMM 24-51-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Primary Logic AMM 24-51-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Full-Authority Digital Engine-Controller (FADEC) AMM 49-61-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Full-Authority Digital Engine-Controller (FADEC) AMM 49-61-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. On the PMAT, access CAIMS Active Faults. Are there any other APU GCU or APU Generator related faults?

    1. If YES, troubleshoot these messages first.
    2. If NO, continue with next step.

  2. In CAIMS, select SYSTEM DIAG, ATA 49, CONTROLLER (FADEC) and make a selection of LRU TEST. Select APU STATUS. Does the GENERATOR READY TO LOAD SIGNAL show as active?

    1. If YES, go to step 4.
    2. If NO, continue with next step.

  3. Re-rack the APU FADEC properly. Is the fault resolved?

    1. If YES, do close out.
    2. If NO, replace APU FADEC.

  4. Swap APU GCU with GCU 2 or 3. Is the fault resolved?

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

  5. Disconnect APU FADEC connector A108BP1. Disconnect APU GCU connector A109P2. Do a continuity check as follows:

    From To Result
    A109P2-38 Ground

    1. If there is continuity, repair defective wiring as required and do close out.
    2. If there is no continuity, continue with next step.

  6. Do a continuity check as follows:

    From To Result
    A109P2-38 A108BP1-A4

    1. If there is no continuity, repair defective wiring as required and do close out.
    2. If there is continuity, continue with next step.

  7. Access the ACPC Logic assembly. Remove PLC 1, PLC 2 and PLC 3. Do a continuity check as follows:

    From To Result
    A109P2-58 Ground

    1. If there is continuity, repair defective wiring as required or replace ACPC if defect is in ACPC and do close out.
    2. If there is no continuity, continue with next step.

  8. Do a continuity check as follows:

    From To Result
    A109P2-58 P315A-7
    A109P2-58 P115A-7
    A109P2-58 P415A-7

    1. If there is no continuity, repair defective wiring as required or replace ACPC if defect is in ACPC and do close out.
    2. If there is continuity, continue with next step.

  9. Reinstall PLC 2 and PLC 3 only. Apply power to the A/C. Is the fault still present?

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

  10. Remove power from the A/C. Remove PLC 2 and reinstall PLC 1. Apply power to the A/C. Is the fault still present?

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

  11. Remove power from the A/C. Remove PLC 3 and reinstall PLC 2. Apply power to the A/C. Is the fault still present?

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

  12. Replace the APU VFG.
  13. Do close out.

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