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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

02/10/21

Message Overview:



Message Name:

INPUT BUS ERROR
(Service Message)

Message Code:

B3-006943

Associated CAS:

None

Reporting LRU: IOC 1
System Description: 31-45-00
Schematic Diagram: 31-45-00
Wiring Diagram: 31-45-01



Message Description:

L IOC has detected an abnormal condition with MUX UART or a status error.

Possible Causes:

  • Left Input/Output Concentrator Unit (IOC) 1 (A4-IOC)
  • Input Error
  • Status Error

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-000-801
Installation of the of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-400-801
Removal of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801

Troubleshooting Recommendations:

  1. Reset L IAPS Circuit Breaker CB1-B6. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.
      NOTE: Before you open the IAPS circuit breakers, make sure that all Engine FADEC circuit breakers are open. If the Engine FADEC circuit breakers remain closed, Engine Igniters will activate. This can cause injury to persons and damage to equipment.

  2. Reset the Electrical Power of the Aircraft. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  3. Swap Left IOC with right IOC. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace defective IOC.

  4. Contact CRC for reporting the failure and obtaining additional troubleshooting procedure.

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