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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

09/23/19

Message Overview:

Fault Message:

SHORT- INL DR LIN ACTR/OPEN RLY WRG

Fault Code:

4960305APU

Associated CAS:

None

Reporting LRU: Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-60-00
Schematic Diagram: 49-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 49-61-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The signals from the open relay in the Linear Actuator to the Full-Authority Digital Engine-Controller (FADEC) are lower than the expected range. This shows a possible short in the Linear Actuator open-relay or the aircraft wiring harness.

Possible Causes:

  • Auxiliary Power Unit (APU) Full-Authority Digital Engine-Controller (FADEC) (A108)
  • Door Actuator (A199)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Operational Test of the APU Starter-Contactor Assembly AMM 24-62-05-710-801 [ 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 Linear Actuator AMM 49-14-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Linear Actuator AMM 49-14-05-400-801 [ 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 ]
Open the Auxiliary Power Unit (APU) Access Doors (321BB) AMM 52-43-00-010-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Close the Auxiliary Power Unit (APU) Access Doors (321BB) AMM 52-43-00-410-801 [ 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 linear actuator (A199) receptacle for contamination and damage.

    1. If there is contamination or damage, go to step 9.
    2. If there is no contamination or damage on the receptacle, continue with next step.

  2. If SHORT - INL DR LIN ACTR/OPEN RLY WRG still shows on the CAIMS PMAT. Perform a check each pin that follows and the grounded shell (WM 49-61). The resistance should measure as follows:

    From To Expected Result Result
    A199P1-A Ground >1 megohm
    A199P1-C Ground >1 megohm

    1. If the resistance is not as mentioned above, go to step 9.
    2. If the resistance is as mentioned above, continue with next step.

  3. If SHORT - INL DR LIN ACTR/OPEN RLY WRG still shows on the CAIMS PMAT. Perform a continuity check between each pin that follows (WM 49-61). The resistance should measure as follows:

    From To Expected Result Result
    P803-L P803-E >1 megohm

    1. If the resistance is not as mentioned above, repair defective wiring as required and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  4. If SHORT - INL DR LIN ACTR/OPEN RLY WRG still shows on the CAIMS PMAT. Perform a check each pin that follows and the grounded shell (WM 49-61). The resistance should measure as follows:

    From To Expected Result Result
    P803-L Ground >1 megohm
    P803-E Ground >1 megohm

    1. If the resistance is not as mentioned above, repair defective wiring as required and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  5. If SHORT - INL DR LIN ACTR/OPEN RLY WRG still shows on the CAIMS PMAT. Perform a continuity check between each pin that follows (WM 49-61). The resistance should be measure as follows:

    From To Expected Result Result
    P803-L P803-E >1 megohm

    1. If the resistance is not as mentioned above, repair defective wiring as required and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  6. If SHORT - INL DR LIN ACTR/OPEN RLY WRG still shows on the CAIMS PMAT. Perform a check each pin that follows and the grounded shell (WM 49-61). The resistance should measure as follows:

    From To Expected Result Result
    J803-L Ground >1 megohm
    J803-E Ground >1 megohm

    1. If the resistance is not as mentioned above, repair defective wiring as required and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  7. If SHORT - INL DR LIN ACTR/OPEN RLY WRG still shows on the CAIMS PMAT. Perform a continuity check between each pin that follows (WM 49-61). The resistance should measure as follows:

    From To Expected Result Result
    P803-L A48P1-e >1 megohm

    1. If the resistance is not as mentioned above, repair defective wiring as required and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  8. If SHORT - INL DR LIN ACTR/OPEN RLY WRG still shows on the CAIMS PMAT. Check for 28 Volts minimum on the APU starter-contactor assembly (A48) receptacle A48P1-e.

    1. If voltage checks are good, do close out.
    2. If voltage check fails, continue with next step.

  9. Replace Linear Actuator (A199).
  10. Do close out.

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