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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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07/18/19

Message Overview:

Fault Message:

None

Fault Code:

28400900

Associated CAS:

FUEL COMPUTR FAIL
(Caution)

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

Fault Description:

FUEL COMPUTR FAIL message shows on the EICAS display when one of the following conditions occur:

  1. Fuel Management Quantity and Gauging Computer (FMQGC) CH A and CH B ARINC output bus to Data Acquisition Unit (DAU) failed (external - No CAIMS messages)
  2. FMQGC CH A and CH B internal failure
  3. FMQGC CH A and CH B electrical power failure (external)

Possible Causes:

  • Data Acquisition Unit (DAU) 1 (A17)
  • Data Acquisition Unit (DAU) 2 (A18)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Data Acquisition Units (DAU) AMM 31-42-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Data Acquisition Units (DAU) AMM 31-42-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to System Diagnostics AMM 45-45-00-970-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Using CAIMS, ensure following FMQGC internal fault messages are not displayed:

    1. FMQGC CH. A COMPUTER/WRG FAULT.
    2. FMQGC CH. B COMPUTER/WRG FAULT.

  2. Check FMQGC output communication with the DAUs. Using CAIMS System Diagnostic pages for each FMQGC channel. Ensure data page information is not red.If data is red, the communication between DAU or PMAT and the FMQGC is invalid.
  3. Check FMQGC CH A and CH B ARINC outputs data communication validity and activity for DAU1 and DAU2.

    1. If FMQGC CH A communications is invalid, continue with next step.
    2. If FMQGC CH B communications is invalid, go to step 5.

  4. Swap DAU 1 and DAU 3.

    1. If fault indication is gone, replace DAU 1 and do close out.
    2. If fault remain, continue with next step.

  5. Swap DAU 2 and DAU 4.

    1. If fault indication is gone, replace DAU 2 and do close out.
    2. If fault remain, continue with next step.

  6. Perform wiring checks between FMQGC CH A and CH B ARINC outputs and DAU1 and DAU2.

    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.

  7. Refer to CAIMS troubleshooting task for further troubleshooting procedures for ARINC communication with the DAU and PMAT.
  8. Do close out.

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