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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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04/07/21

Message Overview:

Message Name:

ECU FAULT

Message Code:

B3-471501

Associated CAS:

None

Reporting LRU: FSU 2
System Description: 46-00-00
Schematic Diagram: 46-21-00
Wiring Diagram: 46-21-03
46-21-05

Message Description:

File Server Unit 2 has reported a External Compensation Unit (ECU) FAULT.

Possible Causes:

  • External Compensation Unit (ECU) (A226)
  • File Server Unit 2 (FSU 2) (A222)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the File Server Unit (FSU) AMM 46-21-01-000-801
Installation of the File Server Unit (FSU) AMM 46-21-01-400-801
Load the Encrypted Application Key (EAK) to the External Compensation Unit (ECU) AMM 46-21-17-970-801
Removal of the External Compensation Unit - IFIS AMM 46-21-17-000-801
Installation of the External Compensation Unit - IFIS AMM 46-21-17-400-801
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. Reset R FILE SERVER (CB2-C6) circuit breaker.

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

  2. Do wiring check between FSU 2 connector A222P1 and ECU 2 connector A226P1. Replace/repair as required.

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

  3. Swap ECUs.

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

  4. Swap FSUs.
  5. Do close out.

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