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(WARNING)
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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

09/13/19

Message Overview:

Fault Message:

STARTER MOTOR NOT DISENGAGED

Fault Code:

4960111APU

Associated CAS:

None

Reporting LRU: Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-40-00
Schematic Diagram: 49-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 49-12-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
49-61-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The start relay feedback voltage is more than 6 volts after the start relay is commanded off. This shows a possible defective relay in the closed position.

Possible Causes:

  • Auxiliary Power Unit (APU) Starter-Contactor Assembly (ASCA) (A48)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the APU Starter-Contactor Assembly AMM 24-62-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the APU Starter-Contactor Assembly AMM 24-62-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Active Faults AMM 45-45-00-970-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
APU Safety Precautions AMM 49-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Engine Branched Wiring-Harness AMM 49-12-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Engine Branched Wiring-Harness AMM 49-12-01-400-801 [ 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. Examine the engine branched wiring-harness for bare wiring, kinks, worn areas and other damage (WM 49-12).

    1. If there is bare wiring, kinks, worn areas or other damage, replace engine branched wiring-harness and do close out.
    2. If NO, continue with next step.

  2. Check if the STARTER MOTOR NOT DISENGAGED still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  3. Examine the aircraft wiring harness between the FADEC (A108) and the APU firewall disconnect (STN 1046LHS) (WM 49-61).

    1. If there is bare wiring, kinks, worn areas or damage, replace or repair defective wiring as required and do close out.
    2. If NO, continue with next step.

  4. Check if the STARTER MOTOR NOT DISENGAGED still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  5. Examine the aircraft wiring harness between the ASCA (A48) and the APU starter motor (B55) (WM 49-61).

    1. If there is bare wiring, kinks, worn areas or damage, replace or repair defective wiring as required and do close out.
    2. If NO, continue with next step.

  6. Check if the STARTER MOTOR NOT DISENGAGED still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  7. Make sure there is no short between each pin C and the connector shell of A48J2 (connector on ASCA) (WM 49-61).

    1. If there is a short, go to step 12.
    2. If there is no short, continue with next step.

  8. Check if the STARTER MOTOR NOT DISENGAGED still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  9. Make sure there is no short between each pin C and the connector shell of A48P2 (ASCA interface) (WM 49-61).

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

  10. Check if the STARTER MOTOR NOT DISENGAGED still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  11. Perform wiring checks between A48P2 (ASCA) and A108BP1 (FADEC).

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  12. Replace APU starter-contactor (A48).
  13. Do close out.

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