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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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04/08/21

Message Overview:

Message Name:

APU S/D-ECU FAIL

Message Code:

B3-006321

Associated CAS:

None

Reporting LRU: APU ECU
System Description: 49-00-00
Schematic Diagram: 49-61-00
Wiring Diagram: 49-61-01 Sh 1
49-61-01 Sh 2

Message Description:

Internal Electronic Control Unit (ECU) failure of severity to require the Auxiliary Power Unit (APU) to shut down.

Possible Causes:

  • Auxiliary Power Unit (APU) Electronic Control Unit (ECU) (A39)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Operational Test of the Auxiliary Power Unit (APU) AMM 49-11-01-710-801
Removal of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-000-801
Installation of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-400-801

Troubleshooting Recommendations:

  1. Do the Operational Test of the Auxiliary Power Unit (APU) and confirm, on the MDC current fault page, while APU is operating, that the fault message is not present.

    1. If the check is satisfactory, do close out.
    2. If the check is not satisfactory, go to next step.

  2. Replace APU ECU (A39).
  3. Do close out.

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