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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:

CRC Montreal (YUL)
Quick Links

04/14/21

Message Overview:

Message Name:

FADEC ECU B

Message Code:

B3-303476

Associated CAS:

L ENGINE MINOR FAULT
(Advisory)

Reporting LRU: L ENG ECU B
System Description: 76-11-00
77-10-00
Schematic Diagram: 77-10-00
Wiring Diagram: None

Message Description:

Left engine FADEC ECU fault B.

[MCID 0910]
FADEC ECU B failure.
A fault internal to the ECU B was sensed.

Possible Causes:

  • Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit B (ECU) (A43)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

  1. When interrogating the MDC or when looking at the engine downloads, look for other MCID codes such as other 600 series or 900 series. Some fault codes combinations can be typical of W5 and/or OSSD failures.
  2. In many cases, the associated CAS messages may not reappear on the next aircraft power-up, however they should be addressed as soon as practical to reduce the possibility of an AOG event in the future.

Quick Links:

Removal of the FADEC Electrical Harness from the Left Engine AMM 71-50-05-000-802
Installation of the FADEC Electrical Harness on the Left Engine AMM 71-50-05-400-802
Removal of W5 harness HON LMM 76-10-01-020-801-A01
Installation of W5 harness HON LMM 76-10-01-420-801-A01
Removal of OSSD HON LMM 76-20-01-020-801-A01
Installation of OSSD HON LMM 76-20-01-420-801-A01
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Interrogate the MDC as follows:

    1. On the cursor control panel, ensure the toggle switch is to the right and select Anti-Ice, ECS and Fuel buttons simultaneously. The MDC main menu should now be displayed on Display Unit #3.
    2. Using the joystick, select Current Faults (if the fault is active) or Aircraft History to research stored faults. From Aircraft History you can then select Fault History and locate the fault. Going into advanced diagnostics will provide an Equation ID for the fault identified.

  2. Check the MDC Current Faults or Fault history and the associated METR (Maintenance Equations and Tables Report) and/or the engine downloads.

    1. If the engine downloads (or MDC) contains other faults such as other 600 series or 900 series, go to step 3.
    2. Otherwise, go to step 4.

  3. Is there any of the combinations of fault codes below found in the engine downloads (or MDC)?

    NOTE: If looking at the MDC, you will only find the Equation ID B3 codes. Refer to the METR to find the corresponding MCID codes. Note that these codes will be preceded by a '0' in the METR and the combinations still apply.

    MCID Codes
    (same date and time)    		 Suspected Component Recommended Action
    605 alone
    or 605 with 900 series    		 OSSD Switch Replace OSSD Switch only
    605 with (600 and 900) series OSSD Switch or W5 Harness or both Replace OSSD Switch andW5 harness
    Other 600 with 900 series
    without 605    		 W5 Harness Replace W5 harness only

    1. If one of the combinations above is found, follow the corresponding recommended action.
    2. If the fault codes do not correspond to any of the above combinations, go to step 4.

  4. Refer to HONEYWELL LMM Subtask 72-00-00-810-137-A01 for detailed troubleshooting steps.

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