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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

09/20/19

Message Overview:

Fault Message:

OPEN CIRCUIT - SURGE VALVE/WIRING

Fault Code:

4960301APU

Associated CAS:

None

Reporting LRU: Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-50-00
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 signals from the Surge Valve Solenoid to the Full-Authority Digital Engine-Controller (FADEC) are out of the expected range. This shows a possible short-circuit in the Surge Valve Solenoid or the signal lines to the FADEC.

Possible Causes:

  • Auxiliary Power Unit (APU) Full-Authority Digital Engine-Controller (FADEC) (A108)
  • Surge Control Valve (MPE2)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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 Surge Valve AMM 49-51-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Surge Valve AMM 49-51-01-400-801 [ 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 there is no bare wiring, kinks, worn areas or other damage, continue with next step.

  2. If OPEN CIRCUIT-SURGE VALVE/WIRING still shows on the CAIMS PMAT, examine the surge valve (MPE2) receptacle for contamination and damage.

    1. If contaminated or damaged, go to step 6.
    2. If there is no contamination or damage, continue with next step.

  3. If OPEN CIRCUIT-SURGE VALVE/WIRING still shows on the CAIMS PMAT, perform a continuity check within the surge valve (MPE2) receptacle (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    MPE2P1-A MPE2P1-B 38-46 ohms

    1. If the resistance is not as mentioned above, go to step 6.
    2. If the resistance is as mentioned above, continue with next step.

  4. If OPEN CIRCUIT-SURGE VALVE/WIRING still shows on the CAIMS PMAT, perform wiring checks between APU (P1) and surge valve (MPE2).

    1. If wiring checks are not good, replace Engine branched wiring-harness and do close out.
    2. If wiring checks are good, continue with next step.

  5. If OPEN CIRCUIT-SURGE VALVE/WIRING still shows on the CAIMS PMAT, perform wiring checks between aircraft wiring harness (J802) and FADEC (A108BP1).

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

  6. Replace Surge Control Valve (MPE2).

    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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