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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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09/16/19

Message Overview:

Fault Message:

APU FUEL FILTER IMPENDING BYPASS

Fault Code:

4960175APU

Associated CAS:

APU FAULT
(Advisory)

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: 49-12-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
49-61-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Full-Authority Digital Engine-Controller (FADEC) received an indication of an Impending Bypass for the sediment filter element.

Possible Causes:

  • Auxiliary Power Unit (APU) Full-Authority Digital Engine-Controller (FADEC) (A108)
  • Impending Bypass Valve and Switch (S4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Access to Active Faults AMM 45-45-00-970-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Stored Faults AMM 45-45-00-970-803 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Sediment Filter Element AMM 49-30-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Sediment Filter Element AMM 49-30-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Impending Bypass Valve-and-Switch AMM 49-30-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Impending Bypass Valve-and-Switch AMM 49-30-09-400-801 [ 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. Remove fuel filter, inspect filter and filter bowl.
  2. Replace APU fuel filter if required, or suspect.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. With APU running, disconnect connector S4P1 at Impending Bypass Valve and Switch.

    1. If system checks are good, do close out.
    2. If fault goes away, continue with next step.

  4. Replace Impending bypass valve and switch.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  5. Perform a wiring check between APU FADEC and impending bypass valve and switch (S4P1). Verify 28 Volts at pin A of connector (S4P1).

    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.

  6. Re-rack FADEC, verify if fault is still present.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  7. Replace FADEC.
  8. Do close out.

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