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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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02/16/21

Message Overview:

Message Name:

NO L-IOC-2 BUS OUTPUT

Message Code:

B3-463347

Associated CAS:

None

Reporting LRU: IOC 1
System Description: 31-45-00
Schematic Diagram: 31-45-00
Wiring Diagram: 31-45-01
31-45-11

Message Description:

L-IOC-2 bus is reported missing by L-TDR and R-TDR.

Possible Causes:

  • Left Input/Output Concentrator Unit (IOC 1) (A4IOC1)
  • Junction Box 4 (JB4)
  • Left Air Traffic Control (ATC) Transponder (A31)
  • Right Air Traffic Control (ATC) Transponder (A30)
  • Left File Server Unit (FSU 1) (A221)
  • Integrated-Avionics Processor System (IAPS) Card Cage (ICC) (A4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Boxes AMM 24-63-01-000-802
Installation of the Junction Boxes AMM 24-63-01-400-802
Removal of the Integrated Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-000-801
Installation 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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Reset L IAPS (CB1-B6) circuit breaker.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Swap IOCs.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  3. Do a wiring check of the ARINC 429 data bus L-IOC-2 from IAPS connector A4P3, through Junction Box 4, to ATC Transponder 1 connector A31P2, to ATC Transponder 2 connector A30P2 and FSU 1 connector A221P1. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

    NOTE: An internal short of any LRUs connected to this data bus might cause this failure.

  4. Swap ATC Transponders.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  5. Replace FSU 1.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  6. Swap FSUs.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  7. Replace ICC.
  8. Do close out.

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