background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults By CAIMS By Tips

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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

07/12/19

Message Overview:

Fault Message:

APU FEED SOV/WRG

Fault Code:

284461BPK

Associated CAS:

APU FUEL SOV
(Caution)

Reporting LRU: Fuel Management Quantity and Gauging Computer (FMQGC) (A47)
System Description: 28-21-00
Schematic Diagram: 28-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 28-21-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Auxiliary Power Unit (APU) FEED VALVE/WRG FAULT shows when the conditions that follow occur:

  1. The APU Fire-Handle is pulled, or the APU is not on.
  2. The APU-Feed Shutoff-Valve Indication is open.

OR

  1. APU Fire-Handle is not pulled.
  2. The APU is on.
  3. The APU-Feed Shutoff-Valve Indication is closed.

Possible Causes:

  • Auxiliary Power Unit (APU) Feed Shutoff-Valve Actuator (L40)
  • Junction Box (JB4)
  • Auxiliary Power Unit (APU) Fire-Handle (A211)
  • Fuel Management Quantity and Gauging Computer (FMQGC) (A47)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB4 AMM 24-00-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB4 AMM 24-00-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Junction Box JB4 Circuit-Cards AMM 24-00-06-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB4 Circuit-Cards AMM 24-00-06-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the APU Feed Shutoff-Valve AMM 28-21-37-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the APU Feed Shutoff-Valve AMM 28-21-37-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the APU-Feed Shutoff-Valve Actuator AMM 28-21-41-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the APU-Feed Shutoff-Valve Actuator AMM 28-21-41-400-801 [ 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:

NOTE: The APU Feed Valve is powered to the closed position.

  1. Access the APU Feed SOV and disconnect connector L40P1. Did the valve remain closed?

    1. If YES, suspect the valve or the valve actuator for failure and replace as required and do close out.
    2. If NO, continue with next step.

  2. Disconnect JB4 connector JB4AP1. Perform a wiring check as follows:

    From To Result
    L40P1-B Ground
    L40P1-D Ground
    L40P1-B L40P1-D

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

  3. Perform a wiring check as follows:

    From To Result
    L40P1-B JB4BP1-41
    L40P1-D JB4BP1-31

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

  4. Perform a wiring check between the APU FIREX Handle and the FMQGC and make sure the handle is providing a ground to the FMQGC.

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

  5. Replace relay K29 on PCB 3 of JB4. Is the fault still present?

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

  6. Replace FMQGC.
  7. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.