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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:

IASC-2 CHANNEL B FAULT
(Service Message)

Message Code:

B3-006926

Associated CAS:

None

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

Message Description:

The channel B of the IASC-2 has detected an internal failure of the controller, but it is still operational. Run IASC #2 power-up test.

Possible Causes:

  • Integrated Air System Controller (IASC-2) (A56)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 18
  2. Fault Logged = AIR,TAXI
  3. Status = DEFERRED MAINT
  4. Message Type = Service Message
  5. {Term Definitions}

    1. IAS2A-95 XX 354 11 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 354B: 13; IASC-2 CHANNEL B FAULT
    2. IAS2A-89 XX 354 10 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 354A: 16; NO A-DCU-4 BUS INPUT
    3. IAS2A-97 XX 354 11 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 354B: 16; NO A-DCU-4 BUS INPUT
    4. IAS2A-84 XX 354 10 EXCT XXXX-XXXX XXXX-XXXX XXXX-XTXX 354A: 11; PIN PROGRAMMING DISAGRE
    5. IAS2A-93 XX 354 11 EXCT XXXX-XXXX XXXX-XXXX XXXX-XTXX 354B: 11; PIN PROGRAMMING DISAGRE
    6. IAS1A-95 XX 354 01 EXCT XXXX-XXXX XXXX-XTXX XXXX-XXXX 354B:19; NO IASC-2 CHANNEL B BUS
    7. IAS2A-91 XX 354 10 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 354A: 18; NO IASC-2 CHANNEL B BUS

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

Troubleshooting Recommendations:

  1. The channel B of the IASC-2 has detected an internal failure of the controller, but it is still operational. Run IASC #2 power-up test.

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