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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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07/22/19

Message Overview:

L FUEL XFER ON
(Status)

DDG Reference: None
Pilot Action (QRH): STATUS-2
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:

L FUEL XFER ON (Status) shows when the conditions that follow occur:

  1. The WING XFER switch on the FUEL control panel is set to ->.
  2. The L WING FEED INHIBIT AUX PUMP pushbutton is not set to OFF.
  3. The left to right transfer command is on.

This troubleshooting applies when it is not under normal conditions.

Possible Causes:

  • WING XFER Switch (S1)
  • L WING FEED INHIBIT AUX PUMP Push Button
  • Fuel Computer (FMQGCS) (A47)
  • Fuel Control Panel (AP5)
  • 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 AMM 28-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Fuel Management and Quantity Gauging Computer 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 L FUEL XFER ON (Status) CAS message does not display when WING XFER knob is in the --> position.

  1. Verify that the L WING FEED INHIBIT AUX PUMP is not 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 -->. On the PMAtT fuel panel data page, does the L to R status change to TRUE?

    1. If YES, then go to step 6.
    2. If NO, then continue with the next step.

  4. Remove fuel control panel and disconnect AP5P1. Perform a wiring continuity check per the table below:

    SWITCH POSTION FROM TO EXPECTED RESULT RESULT
    --> AP5J1 - 34 AP5J1 - 33 Continuity
    --> AP5J1 - 33 Airframe Ground Continuity

    1. If the wiring checked good, then continue with the next step.
    2. If the wiring from AP5J1 - 34 to AP5J1 - 33 is not good, suspect the Wing fuel transfer switch (S1), or the fuel control panel (AP5).
    3. If the wiring from AP5P1 - 33 to airframe ground is not good, then suspect Ground Stud (GS852). Or associated wiring to it.

  5. Remove the FMQGC and perform the wiring continuity check below:

    SWITCH POSITION FROM TO EXPECTED RESULT RESULT
    --> AP5P1 - 34 A47DP1 - E14 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.

  6. 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 (A47).
    2. If NO, then continue to next step.

  7. Do close out.

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