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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:

CRC Montreal (YUL)
Quick Links

08/10/21

Message Overview:

Message Name:

IASC-1 INPUT DISAGREE
(Service Message)

Message Code:

B3-289428

Associated CAS:

None

Reporting LRU: IASC1 TST A
System Description: 21-00-00
Schematic Diagram: None
Wiring Diagram: 21-31-05

Message Description:

IASC-1 has detected a disagree between IASC1 and IASC2.

Possible Causes:

  • Integrated Air System Controller 1 (IASC1) (A55)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Using Raw data IASC1A, IASC1B, IASC2A, IASC2B, check wiring of discrete input (Emer Depress, Man Press, Ditching, Air Source, WAI on and WAI source) and wiring of analog input (CPCS Cabin Pressure).
  2. Deferred maintenance, maintenance action can be postponed for convenience.
  3. Suspect the #1 IAS controller, remove and replace per AMM.
  4. Operational test IAW AMM.

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