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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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07/15/19

Message Overview:

Fault Message:

LH AFT XFER PUMP/PRESS SW/WRG

Fault Code:

2844623PK

Associated CAS:

AFT XFER FAIL
(Caution)

AFT XFER FAULT
(Advisory)

Reporting LRU: Fuel Management and Quantity Gauging Computer (FMQGC)
System Description: 28-22-00
Schematic Diagram: 28-22-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 28-22-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

L AFT XFER PMP/PRES SWITCH/WRG FAULT shows when:

  1. Left AFT Transfer-Pump is commanded ON

    • Left AFT Transfer-Pump Pressure Switch status is low
    • Electrical Management System Control Display Unit (EMS CDU) has not failed

    OR

  2. Left AFT Transfer-Pump is commanded OFF

    • Left AFT Transfer-Pump Pressure Switch status is high
    • EMS CDU has not failed

Possible Causes:

  • Left AFT Transfer Pump (B34)
  • Left AFT Transfer-Pump Pressure-Switch (S22)
  • Fuel Management and Quantity Gauging Computer (FMQGC) (A47)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Aft Transfer Pumps AMM 28-22-25-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Aft Transfer Pumps AMM 28-22-25-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Aft Transfer-Pump Pressure-Switches AMM 28-22-29-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Aft Transfer-Pump Pressure-Switches AMM 28-22-29-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Computer AMM 28-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Computer AMM 28-41-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. If the message is present while the transfer pump is set to 'OFF', continue with next step. If message is present while transfer pump is set to 'ON', go to step 3.
  2. With A/C power off and fuel system unpressurized, perform a continuity check on FMQGC connector A47AP1-E14.

    1. If there is continuity to ground on pin E14, investigate wiring interface and/or replace pressure switch and do close out.
    2. If there is no continuity to ground, continue with next step.

  3. Swap the left aft transfer pump pressure switch with the right aft transfer pump pressure switch. Is the fault still present?

    1. If NO, replace left aft transfer pump pressure switch.
    2. If YES, continue with next step.

  4. Make sure the left aft transfer occurs when the pump is set top 'ON'.

    1. If fuel transfer does not occur, investigate the fuel pump.
    2. If fuel transfer occurs, continue with next step.

  5. Remove the FMQGC and re-install it, making sure it is properly and fully inserted into place. Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  6. Replace the FMQGC.
  7. Do close out.

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