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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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For AOG assistance contact:

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Quick Links

08/09/21

Message Overview:

Message Name:

CH A FAULT

Message Code:

B3-007331

Associated CAS:

AIR COND FAULT
(Advisory)

Reporting LRU: PK DISCH T SNSR
System Description: 21-61-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

The channel A of the PACK DISCHARGE TEMPERATURE SENSOR is detected failed.

Possible Causes:

  • Pack Discharge Temperature Sensor (MT33)
  • Integrated Air System Controller (IASC1) (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. Message Type = Fault Message

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 Integrated Air System (IAS) Controller AMM 21-31-01-710-801
Removal of the Pack Discharge Temperature-Sensor AMM 21-52-37-000-801
Installation of the Pack Discharge Temperature-Sensor AMM 21-52-37-400-801
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. The channel A of the PACK DISCHARGE TEMPERATURE SENSOR is detected failed. Check the sensor or the wiring to the sensor and the IASC #1.

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