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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 FAULT

Message Code:

B3-006375

Associated CAS:

EQPT RACK COOL FAULT
(Advisory)

Reporting LRU: AVIONICS T SNSR1
System Description: 21-61-00
Schematic Diagram: 21-61-00
Wiring Diagram: 21-61-25

Message Description:

The channel A of the LEFT EQUIPMENT RACK VENTILATED TEMPERATURE SENSOR is detected failed.

Possible Causes:

  • Ventilated Temperature Sensor (MT39)
  • Integrated Air System (IAS) Controller #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-48
  6. {Term Definitions}

    1. IAS1A-48 XX 353 00 EXCT XXXX-XXXX XXXX-XXXX XXXX-TXXX 353A:12; L EQPT RACK VENT SNSR A

Quick Links:

Removal of the Equipment Rack Vent Temperature Sensor AMM 21-23-01-000-801
Installation of the Equipment Rack Vent Temperature Sensor AMM 21-23-01-400-801
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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Check the sensor or the wiring to the sensor and the IASC #1.

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