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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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Quick Links

07/16/19

Message Overview:

Fault Message:

LH DC AUX PUMP PRESS SW/WRG

Fault Code:

2844613PK

Associated CAS:

-> FUEL XFER FAIL
(Caution)

-> FUEL XFER ON
(Caution)

L AUX FUEL PUMP
(Advisory)

Reporting LRU: Fuel Management and Quantity Gauging System (FMQGC)
System Description: 28-21-00
Schematic Diagram: 28-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
28-22-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 28-20-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]
28-21-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
28-41-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

L DC AUX PUMP/PRES SWITCH/WRG FAULT shows on the CAIMS PMAT when the conditions that follow occur:

  • The L WING FEED INHIBIT AUX PUMP Push-Button on the FUEL Control Panel is not set to OFF
  • The Left Aux Pump command is on
  • The Left Aux-Pump Pressure-Indication is low
  • The Electrical Management System (EMS) / AC Power Center (ACPC) has not failed or,
  • The L WING FEED INHIBIT AUX PUMP Push-Button on the FUEL Control Panel is set to OFF or the Left Aux Pump command is off
  • The Left Aux-Pump Pressure-Indication is high
  • The EMS/SPDA has not failed

Possible Causes:

  • Fuel Panel (AP5)
  • DC Auxiliary-Pump Canister
  • Left DC Auxiliary Pump-Cartridge (B10)
  • Left DC Auxiliary-Pump Pressure-Switch (S11)
  • Fuel Management and Quantity Gauging Computer (FMQGC) (A47)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Connect Electrical Power to the Aircraft AMM 24-00-00-861-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Remove the Electrical Power from the Aircraft AMM 24-00-00-861-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Fuel-System Safety Precautions AMM 28-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Wing-Tank Access Panels AMM 28-11-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Wing-Tank Access Panels AMM 28-11-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the FUEL Control Panel AMM 28-20-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the FUEL Control Panel AMM 28-20-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the DC Auxiliary Pumps AMM 28-21-00-710-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the DC Auxiliary-Pump Cartridges AMM 28-21-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the DC Auxiliary-Pump Cartridges AMM 28-21-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the DC Auxiliary-Pump Canisters AMM 28-21-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the DC Auxiliary-Pump Canister AMM 28-21-17-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the DC Auxiliary-Pump Pressure-Switches AMM 28-21-21-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the DC Auxiliary-Pump Pressure-Switches AMM 28-21-21-400-801 [ 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 ]
Access to Active Faults AMM 45-45-00-970-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to System Diagnostics AMM 45-45-00-970-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Leading Edge Panels (BL52.45 to L/E STA 134.818) AMM 57-41-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Leading Edge Panels (BL52.45 to L/E STA134.818) AMM 57-41-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Safety Precautions - Maintenance Practices - ALL SPM 20-00-01-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Check that the L WING FEED INHIBIT AUX PUMP push-button on the FUEL control panel is ON. Select the LEFT TO RIGHT XFLOW page in CAIMS on the PMAT. Select TURN LEFT DC (FEED) PUMP ON. Is the PUMP PRESSURE "Not Low"?

    1. If YES, go to step 14.
    2. If NO, continue with next step.

  2. Select OPEN LEFT XFLOW VALVE from the LEFT TO RIGHT XFLOW page. Check if the fuel quantity increases in the right wing tank.

    1. If the fuel quantity increases in the right wing tank, go to step 7.
    2. If the fuel quantity does not increase in the right wing tank, continue with next step.

  3. Check if there is 28 ±2 VDC at B10P1-A.

    1. If check is good, go to step 18.
    2. If check is not good, continue with next step.

  4. Perform a continuity check as follows:

    From To Result
    A94P1-45 Ground
    A91P1-45 Ground

    1. If there is continuity, go to step 19.
    2. If there is no continuity, continue with next step.

  5. Perform a continuity check as follows:

    From To Result
    AP5P1-38 Ground

    1. If there is continuity, go to step 22.
    2. If there is no continuity, continue with next step.

  6. Perform a continuity check as follows:

    From To Result
    A47AP1-B14 Ground

    1. If there is continuity, repair defective wiring as required and do close out.
    2. If there is no continuity, go to step 33.

  7. Set the L WING FEED INHIBIT AUX PUMP push-button on the FUEL control panel to OFF. Select the LEFT TO RIGHT XFLOW page in CAIMS on the PMAT. Is the PUMP PRESSURE "Not Low"?

    1. If NO, go to step 11.
    2. If YES, continue with next step.

  8. Select OPEN LEFT XFLOW VALVE from the LEFT TO RIGHT XFLOW page. Check if the fuel quantity stays the same in the right wing tank.

    1. If YES, go to step 23.
    2. If NO, continue with next step.

  9. Perform a continuity check as follows:

    From To Result
    A94P1-44 Ground
    A91P1-44 Ground

    1. If there is continuity, perform the troubleshooting for the EMS/SPDA.
    2. If there is no continuity, continue with next step.

  10. Perform a continuity check as follows:

    From To Result
    AP5P1-41 Ground
    AP5P2-65 Ground

    1. If there is continuity, repair or replace defective wiring as required and do close out.
    2. If there is no continuity, go to step 32.

  11. Check that the L WING FEED INHIBIT AUX PUMP push-button is not set to OFF. Select TURN LEFT DC (FEED) PUMP OFF from the LEFT TO RIGHT XFLOW page on the CAIMS PMAT. Is the PUMP PRESSURE "Low"?

    1. If YES, go to step 24.
    2. If NO, continue with next step.

  12. Perform a continuity check as follows:

    From To Result
    A94P1-45 Ground
    A91P1-45 Ground

    1. If there is no continuity, perform the troubleshooting for the EMS/SPDA.
    2. If there is continuity, continue with next step.

  13. Perform a continuity check as follows:

    From To Result
    AP5P1-63 Ground
    AP5P2-64 Ground

    1. If there is continuity, go to step 27.
    2. If there is no continuity, repair or replace defective wiring as required and do close out.

  14. Select the COCKPIT FUEL PANEL PAGE 4 on the CAIMS PMAT. Is the LEFT AUX PUMP INHIBIT PANEL SWITCH status "Lamp Off"?

    1. If YES, go to step 31.
    2. If NO, continue with next step.

  15. Perform a continuity check as follows:

    From To Result
    AP5P1-48 Ground

    1. If there is no continuity, go to step 32.
    2. If there is continuity, continue with next step.

  16. Perform a continuity check as follows:

    From To Result
    A47AP1-C13 Ground

    1. If there is continuity, repair or replace defective wiring as required and do close out.
    2. If there is no continuity, go to step 33.

  17. Perform a continuity check as follows:

    From To Expected Result Result
    S11P1-G S11P1-H Closed
    S11P1-A S11P1-H Open

    1. If there is continuity, repair or replace defective wiring as required and do close out.
    2. If there is no continuity, go to step 31.

  18. Perform a operational test of the DC Aux Pump. Is the operational test satisfactory?

    1. If it is satisfactory, do close out.
    2. If it is not satisfactory, go to step 31.

  19. Check if there is 28 ±2 VDC at A14P4-h (SPDA2).

    1. If check is good, repair or replace defective wiring as required and do close out.
    2. If check is not good, continue with next step.

  20. Perform a continuity check as follows:

    From To Result
    A94P1-44 Ground
    A91P1-44 Ground

    1. If there is no continuity, perform the troubleshooting for the EMS/SPDA.
    2. If there is continuity, continue with next step.

  21. Perform a continuity check as follows:

    From To Result
    AP5P1-41 A94P1-44
    AP5P2-65 A91P2-44

    1. If there is no continuity, repair or replace defective wiring as required and do close out.
    2. If there is continuity, go to step 32.

  22. Perform a continuity check as follows:

    From To Result
    AP5P1-63 A94P1-45
    AP5P2-64 A91P2-45

    1. If there is no continuity, repair or replace defective wiring as required and do close out.
    2. If there is continuity, go to step 32.

  23. Check if there is a short circuit and an open circuit within Left AUX DC Pump Switch as follows:

    From To Expected Result Result
    S11P1-H S11P1-A continuity
    S11P1-H S11P1-G open

    1. If there is no continuity, repair or replace defective wiring as required and do close out.
    2. If there is continuity, go to step 31.

  24. Select the COCKPIT FUEL PANEL DATA PAGE 4 on the CAIMS PMAT. Is the LEFT AUX PUMP INHIBIT PANEL SWITCH status "Lamp Off"?

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

  25. Perform a continuity check as follows:

    From To Result
    AP5P1-48 Ground

    1. If there is no continuity, go to step 32.
    2. If there is continuity, continue with next step.

  26. Perform a continuity check as follows:

    From To Result
    A47AP1-C13 Ground

    1. If there is continuity, repair or replace defective wiring as required and do close out.
    2. If there is no continuity, go to step 33.

  27. Perform a continuity check as follows:

    From To Result
    AP5P1-38 Ground
    AP5P1-7 Ground
    AP5P1-8 Ground

    1. If there is no continuity, go to step 32.
    2. If there is continuity, continue with next step.

  28. Check if any of the following fault messages shown on the EICAS display.

    1. If YES, select the fault message in the above menu list and perform the applicable troubleshooting.
    2. If NO, continue with next step.

  29. Check if the following fault messages shown on the CAIMS PMAT.

    1. If YES, select the fault message in the above menu list and perform the applicable troubleshooting.
    2. If NO, continue with next step.

  30. Perform a continuity check as follows:

    From To Result
    A47AP1-B14 Ground

    1. If there is no continuity, repair or replace defective wiring as required and do close out.
    2. If there is continuity, continue with next step.

  31. Replace Left DC Aux-Pump Pressure-Switch.

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

  32. Replace Fuel Control Panel.

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

  33. Replace the FMQGC.
  34. Do close out.

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