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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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For AOG assistance contact:

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Quick Links

09/18/24

Message Overview:

Fault Message:

L FMU[COSS FAILURE]

Fault Code:

7325527LBR

Associated CAS:

L FADEC FAIL
(Caution)

Reporting LRU: Left Engine Electronic Controller (EEC)
System Description: 73-20-00
Schematic Diagram: None
Wiring Diagram: 71-50-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The Combined Overspeed and Shut-off Solenoid (COSS) in the Fuel Metering Unit (FMU) does not operate. This condition occurs when:

  • The High Pressure Shut-Off Valve (HPSOV) does not agree with the selection

OR

  • During Independent Overspeed Protection (IOP) checks

The FMU circuits are continuously monitored by the Full-Authority Digital Engine-Controller (FADEC).

Possible Causes:

  • Fuel Metering Unit (FMU)
  • Left Engine Electronic Controller (EEC)
  • Throttle Quadrant Assembly (AP41)
  • SPDA 4 (A16)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

 NOTES:

  • This condition occurs when:
    -The High Pressure Shut-Off Valve (HPSOV) does not agree with the selection.
    -During Independent Overspeed Protection (IOP) checks.
  • The FMU circuits are continuously monitored by the FADEC.

Quick Links:

Opening of the Cowls AMM 71-10-00-010-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Closing of the Cowls AMM 71-10-00-410-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Throttle Quadrant AMM 76-10-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Throttle Quadrant AMM 76-10-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of FADEC System EMM 73-21-00-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Eng Electronic Controller (EEC)
Mod 73-101559		 EMM 73-21-01-000-801-B00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Eng Electronic Controller (EEC)
Mod 73-101559		 EMM 73-21-01-400-801-B00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Fuel Metering Unit EMM 73-21-03-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Fuel Metering Unit EMM 73-21-03-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Manual of the Engine Speed Control WM 76-10-01 [Global Express] [G5000] [Global XRS]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Interchange EECs.

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

  2. Perform wiring checks between the EEC 1 CHA (P1044) to FMU1 (P1049)

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

  3. Perform wiring checks between the EEC 1 CHB (P1047) to FMU1 (P1050)

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

  4. Perform wiring checks between EEC 1 CHA (P1045) and EEC CHB (P1048) and the fixed cowl interface (2PA2 and 2PB4)

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

  5. Perform wiring checks between throttle quadrant (AP41P2) and FMU1 (P712)

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

  6. Perform wiring checks between throttle quadrant (AP41P2) and EEC1 CHA (P1045).

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

  7. Perform wiring checks between SPDA4 (A16P4) and throttle quadrant (AP41P2)

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

  8. Interchange SPDA 4 with SPDA

    1. If system checks are good, replace SPDA 4 and do close out.
    2. If fault remains, continue with next step.

  9. Replace throttle quadrant.

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

  10. Replace FMU 1.
  11. Do close out.

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