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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

01/29/21

Message Overview:

Message Name:

CH A&B FAULT

Message Code:

B3-006407

Associated CAS:

PACK FAIL
(Caution)

Reporting LRU: COMP TEMP SNSR
System Description: 21-61-00
Schematic Diagram: 21-61-00
Wiring Diagram: 21-52-17

Message Description:

Both channels of the COMPRESSOR DISCHARGE TEMPERATURE SENSOR are detected failed.

Possible Causes:

  • Compressor Discharge Temperature (CDT) Sensor (MT29)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 1
  2. Fault Logged = AIR,TAXI
  3. Status = FAILED/WIRING
  4. Timer = 5
  5. Logic = IAS1A-52 AND IAS2A-57
  6. {Term Definitions}

    1. IAS1A-52 XX 353 00 EXCT XXXX-XXXX XXXX-XXXT XXXX-XXXX 353A:17; COMP DISCHRG TEMP SNSR
    2. IAS2A-57 XX 353 10 EXCT XXXX-XXXX XXXX-XXXT XXXX-XXXX 353A:17; COMP DISCHRG TEMP SNSR

Quick Links:

Removal of the Compressor Discharge Temperature Sensor AMM 21-52-17-000-801
Installation of the Compressor Discharge Temperature Sensor AMM 21-52-17-400-801
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. Check for sensor failure.

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