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Select color for CAS message that you wish to troubleshoot

(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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07/22/19

Message Overview:

WING FUEL XFER OFF
(Status)

DDG Reference: None
Pilot Action (QRH): STATUS-3
System Description: 28-22-00
Schematic Diagram: 28-22-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 28-22-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

WING FUEL XFER OFF (Status) shows when the WING XFER switch on the FUEL control panel is set to OFF.

This troubleshooting applies when it is not under normal conditions.

Possible Causes:

  • XFER Switch on Fuel Control Panel (AP5)
  • Fuel Management and Quantity Gauging Computer FMQGC (A47)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Fuel Management and Quantity Gauging Computer (FMQGC) AMM 28-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Fuel Management and Quantity Gauging Computer (FMQGC) AMM 28-41-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the fuel control panel (AP5) AMM 28-20-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the fuel control panel (AP5) AMM 28-20-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

The WING FUEL XFER OFF (Status) CAS message does not display when WING XFER knob is in the "OFF" position.

  1. Verify that no WING FEED INHIBIT AUX PUMP switches are set to ON.
  2. Power up the aircraft and the CAIMS PMAT.

    • Access CAIMS.
    • Select System Diagnostics.
    • Select 28-00 Fuel.
    • Select Computer (FMQGC CH A(B)).
    • Select LRU Test.
    • Select Cockpit fuel panel data CH A(B).

  3. On the fuel control panel, rotate the WING XFER knob to OFF. On the PMAT fuel panel data page, does the Manual Transfer OFF status change to TRUE?

    1. If YES, then go to step 10.
    2. If NO, then continue with the next step.

  4. Remove the fuel control panel (AP5).
  5. Disconnect connector AP5P2 and perform a wiring continuity check per the table below:
    NOTE: Turn WING XFER knob to OFF.

    SWITCH POSITION FROM TO EXPECTED RESULT RESULT
    OFF AP5J2 - 50 Airframe Ground Continuity

    1. If the wiring checked good, then go to step 10.
    2. If the wiring was not good, then continue with the next step.

  6. Re-connect AP5P2. And disconnect AP5P1.
  7. Perform a wiring continuity check per the table below:

    SWITCH POSITION FROM TO EXPECTED RESULT RESULT
    OFF AP5P1 - 33 Airframe Ground Continuity

     

    1. If the wiring checks good, then go to next step.
    2. If the wiring is not good, then suspect Ground Stud (GS852). Or associated wiring to it.

  8. Disconnect AP5P2 and perform the wiring continuity check per the table below:

    SWITCH POSITION FROM TO EXPECTED RESULT RESULT
    OFF AP5J2 - 50 AP5J1 - 33 Continuity

     

    1. If the wiring check is good, then continue with the next step.
    2. If the wiring check is not good, then suspect the Wing Transfer Switch (S1), or the fuel control panel (AP5).

  9. Perform a wiring continuity check per the table below:

    SWITCH POSITION FROM TO EXPECTED RESULT RESULT
    OFF AP5P2 - 50 A47DP1 - D14 Continuity

     

    1. If the wiring check is good, continue with the next step.
    2. If the wiring check is not good, then suspect wiring from Fuel control panel to FMQGC needs repaired or replaced.

  10. Re-rack or re-install the FMQGC making sure it is fully and properly pushed into place. Is the fault still present?

    1. If YES, then suspect the FMQGC.
    2. If NO, then go to next step.

  11. Do close out.

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