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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 DCU-4 CH A BUS INPUT

Message Code:

B3-006923

Associated CAS:

None

Reporting LRU: IASC2 TST A
System Description: 21-61-00
Schematic Diagram: None
Wiring Diagram: 31-41-01

Message Description:

Both A & B channels of the IASC-2 do not receive any data from the Data Concentrator Unit channel A.

Possible Causes:

  • Integrated Air System Controller (IASC2) (A56)
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None


Fault Confirmation Procedure:

  1. Message# = 14
  2. Fault Logged = AIR,TAXI
  3. Status = LRU OK / INFO
  4. Message Type = Fault Message
  5. {Term Definitions}

    1. IAS2A-89 XX 354 10 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 354A: 16; NO A-DCU-4 BUS INPUT
    2. IAS2A-97 XX 354 11 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 354B: 16; NO A-DCU-4 BUS INPUT
    3. DCU1-1 1X 340 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 340: (A) NO IOC 1X IN
    4. IAS1A-84 XX 354 00 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 354A: 16; NO DCU-4 CHANNEL A BUS
    5. IAS1A-92 XX 354 01 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 354B: 16; NO DCU-4 CHANNEL A 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
Removal of the Data Concentrator Unit (DCU) AMM 31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM 31-41-01-400-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Both A & B channels of the IASC-2 do not receive any data from the Data Concentrator Unit channel A. Suspect DCU.

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