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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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01/29/21

Message Overview:

Message Name:

CH A FAULT
(Service Message)

Message Code:

B3-006401

Associated CAS:

AIR COND FAULT
(Advisory)

Reporting LRU: CAB VENT T SNSR
System Description: 21-61-00
Schematic Diagram: 21-61-00
Wiring Diagram: 21-61-21

Message Description:

The channel A of the CABIN VENTILATED TEMPERATURE SENSOR is detected failed.

Possible Causes:

  • Cabin Ventilated Temperature Sensor (MT28)
  • Integrated Air System Controller 1 (IASC 1) (A55)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 2
  2. Fault Logged = AIR,TAXI
  3. Status = FAILED/WIRING
  4. Timer = 7
  5. Logic = IAS1A-57 AND NOT IAS2A-62
  6. {Term Definitions}

    1. IAS1A-57 XX 353 00 EXCT XXXX-XXXX XTXX-XXXX XXXX-XXXX 353A:23; CABIN VENTILATED SNSR A
    2. IAS2A-62 XX 353 10 EXCT XXXX-XXXX XTXX-XXXX XXXX-XXXX 353A:23; CABIN VENTILATED SNSR B

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
Removal of the Cabin Ventilated Temperature-Sensor AMM 21-61-21-000-801
Installation of the Cabin Ventilated Temperature-Sensor AMM 21-61-21-400-801
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. Check the sensor or the wiring to the sensor and the IASC #1.

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