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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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08/09/21

Message Overview:

Message Name:

NO IASC-1A BUS INPUT

Message Code:

B3-006918

Associated CAS:

None

Reporting LRU: IASC2 TST A
System Description: 21-61-00
Schematic Diagram: None
Wiring Diagram: 21-61-01

Message Description:

The channel A of the IASC-2 does not receive any data from the opposite IASC-1 channel A, but the IASC-1 channel B does receive data.

Possible Causes:

  • Integrated Air System Controller (IASC1) (A55)
  • Integrated Air System Controller (IASC2) (A56)
  • Junction Box 1 (JB1)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 9
  2. Fault Logged = AIR,TAXI
  3. Status = FAILED/WIRING
  4. Message Type = Fault Message
  5. {Term Definitions}

    1. IAS2A-92 XX 354 10 EXCT XXXX-XXXX XXXX-XTXX XXXX-XXXX 354A: 19; NO IASC-1 CHANNEL A BUS
    2. IAS1A-94 XX 354 01 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 354B: 18; NO IASC-1 CHANNEL A BUS

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 Junction Box JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. The channel A of the IASC-2 does not receive any data from the opposite IASC-1 channel A, but the IASC-1 channel B does receive data. Check wiring.

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