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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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02/02/21

Message Overview:

Message Name:

IASC2 RS422 DISABLE FAIL

Message Code:

B3-006921

Associated CAS:

None

Reporting LRU: IASC2 TST A
System Description: 21-61-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

The discrete input AUTO PRESS 1 IN from the IASC-1 to the IASC-2 is detected failed.

Possible Causes:

  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 12
  2. Fault Logged = AIR,TAXI
  3. Status = FAILED/WIRING
  4. Message Type = Fault Message
  5. {Term Definitions}

    1. IAS2A-4 XX 350 10 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 350A: 18; IASC-2 RS422 DISABLE CM

Quick Links:

Operational Test of the Cabin Pressure Control System AMM 21-31-00-710-801
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
Operational Test of the Integrated Air System (IAS) Controller AMM 21-31-01-710-801
Removal of the Outflow Valve AMM 21-31-05-000-801
Installation of the Outflow Valve AMM 21-31-05-400-801
Removal of the Junction Box JB2 AMM 24-63-05-000-803
Installation of the Junction Box JB2 AMM 24-63-05-400-803
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. The discrete input AUTO PRESS 1 IN from the IASC-1 to the IASC-2 is detected failed.
  2. Check wiring.

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