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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

03/03/21

Message Overview:

Message Name:

CH A FAULT
(Service Message)

Message Code:

B3-007776

Associated CAS:

None

Reporting LRU: R I/B TEMP SNSR
System Description: 30-12-00
Schematic Diagram: 30-12-00
Wiring Diagram: 30-11-01

Message Description:

The channel A of the Right Inboard Wing Leading Edge Temperature Sensor is detected failed.

Possible Causes:

  • Right Inboard Temperature Sensor (MT32)
  • Left Integrated Air System (IAS) Controller (IASC 1) (A55)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Leading-Edge Temperature Sensor Resistance Values

Quick Links:

Removal of the Integrated Air System (IAS) Controller AMM 21-31-01-000-801
Installation of the Integrated Air System (IAS) Controller AMM 21-31-01-400-801
Operational Test of the Leading-Edge Temperature Sensors AMM 30-11-00-710-801
Removal of the Inboard Leading-Edge Temperature Sensor AMM 30-11-01-000-801
Installation of the Inboard Leading-Edge Temperature Sensor AMM 30-11-01-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Perform Operational Test of the Leading-Edge Temperature Sensors.

    1. If the test is satisfactory, do close out.
    2. If the test is not satisfactory, continue with next step.

  2. Swap the Left IASC (A55) with the Right IASC (A56). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace defective IASC.

  3. Do wiring check between the Left IASC (A55) and the Right Inboard Temp Sensor (MT32).

    From To Results
    Conn. A55P3 - 2 Splice SP71
    Conn. A55P3 - 7 Splice SP72

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

  4. Replace Right Inboard Temp Sensor (MT32).
  5. Do close out.

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