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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

07/06/21

Message Overview:

Message Name:

POSITION OF APU INLET DOOR DOES NOT AGREE WITH POSITION SET

Message Code: 496OBS007
Effectivity: All
System: Auxiliary Power Unit (APU) Automatic Control System
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 ]

Message Description:

During Auxiliary Power Unit (APU) operation, the Inlet Door was not in the correct position, or was not in the fully closed position after the APU was stopped.

Possible Causes:

  • Full-Authority Digital Engine-Controller (FADEC) (A108)
  • Linear Actuator (A199)
  • Auxiliary Power Unit (APU) Start Contactor Assembly (A48)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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. On the CAIMS PMAT, get access to the active faults.

    1. If the fault message FADEC CONTROLLER shows on the CAIMS PMAT, go to step 12.
    2. If APU DOOR FAIL (Caution) show on the EICAS primary display, continue with next step.

  2. Examine the inlet door for blockage.

    1. If the inlet door has blockage, remove the blockage from the inlet door and do close out.
    2. If the inlet door has no blockage, continue with next step.

  3. Start the APU and operate the APU with no load for a minimum of two minutes.
  4. Perform an APU shutdown (normal).

    1. If APU DOOR FAIL (Caution) does not show on the EICAS primary display, do close out.
    2. If APU DOOR FAIL (Caution) still show on the EICAS primary display, continue with next step.

  5. Examine the linear actuator (A199) receptacle for contamination and damage.

    1. If linear actuator (A199) receptacle has contamination or damage, replace linear actuator (A199) and do close out.
    2. If linear actuator (A199) receptacle has no contamination or damage, continue with next step.

  6. Perform a resistance check as follows:

    From To Expected Result Result
    A199-A Ground >1 Megaohm
    A199-C Ground >1 Megaohm

    1. If the resistance values are not as specified, repair as required and do close out.
    2. If the resistance values are as specified, continue with next step.

  7. Perform wiring checks between APU (P803) and Linear actuator (A199P1).

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

  8. Perform a resistance check as follows:

    From To Expected Result Result
    A199P1-A Ground >1 Megaohm
    A199P1-B Ground >1 Megaohm
    A199P1-C Ground >1 Megaohm
    A199P1-D Ground >1 Megaohm

    1. If the resistance values are not as specified, repair as required and do close out.
    2. If the resistance values are as specified, continue with next step.

  9. Perform a resistance check as follows:

    From To Expected Result Result
    J803-L Ground <3 Ohms
    A48P1-e Ground <3 Ohms

    1. If the resistance values are not as specified, repair as required and do close out.
    2. If the resistance values are as specified, continue with next step.

  10. Perform a resistance check as follows:

    From To Expected Result Result
    J803-E Ground <3 Ohms
    J803-F Ground <3 Ohms
    A108BP1-C4 Ground <3 Ohms
    A108BP1-D4 Ground <3 Ohms

    1. If the resistance values are not as specified, repair as required and do close out.
    2. If the resistance values are as specified, continue with next step.

  11. Perform a resistance check as follows:

    From To Expected Result Result
    J803-E Ground >1 Megaohm
    J803-F Ground >1 Megaohm

    1. If the resistance values are not as specified, repair as required and do close out.
    2. If the resistance values are as specified, continue with next step.

  12. Replace FADEC.
  13. Do close out.

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