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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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Quick Links

04/08/21

Message Overview:

Message Name:

NO DATA OUTPUT TO ECU
(Service Message)

Message Code:

B3-006341

Associated CAS:

APU FAULT
(Advisory)

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

Message Description:

Auxiliary Power Unit (APU) Electronic Control Unit (ECU) is reporting that no data is received from the APU Hour meter.

Possible Causes:

  • Auxiliary Power Unit (APU) Electronic Control Unit (ECU) (A39)
  • Hourmeter (A174)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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
Read and Record the Hours of the Auxiliary Power Unit (APU) Operation AMM 49-70-00-970-801
Removal of the APU Hourmeter CMM 49-24-59
Installation of the APU Hourmeter CMM 49-24-59
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Do wiring check between the APU ECU (A39) and the APU Hourmeter (A174) for the following wires:

    From To Result
    Conn. A39BP1-13C Conn. A174P1-A
    Conn. A39BP1-13D Conn. A174P1-B
    Conn. A39BP1-13A Conn. A174P1-C

    1. If the check is satisfactory, continue with next step.
    2. If the check is not satisfactory, repair defective wiring.

  2. Replace the APU Hourmeter (A174). Is the fault message still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

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

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