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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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04/07/21

Message Overview:

Message Name:

NO L-IOC-2 BUS INPUT

Message Code:

B3-471463

Associated CAS:

None

Reporting LRU: FSU 1
System Description: 46-00-00
Schematic Diagram: 46-21-00
Wiring Diagram: 31-45-11
46-21-01

Message Description:

Left File Server Unit (FSU) is reporting L-Input/Output Concentrator Unit (IOC)-2 inactive while L-IOC-2 data is not reported inactive by the left TDR.

Possible Causes:

  • Left File Server Unit (FSU 1) (A221)
  • Junction Box 4 (JB4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Junction Boxes-Component Location AMM 24-63-00-992-802
Removal of the Junction Box JB4 AMM 24-63-13-000-802
Installation of the Junction Box JB4 AMM 24-63-13-400-802
Removal of the Junction Box JB4 Circuit-Cards AMM 24-63-13-000-803
Installation of the Junction Box JB4 Circuit-Cards AMM 24-63-13-400-803
Functional Test of Junction Box JB4 AMM 24-63-13-720-801
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
Operational Test of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-710-801
Removal of the File Server Unit (FSU) AMM 46-21-01-000-801
Installation of the File Server Unit (FSU) AMM 46-21-01-400-801
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 FILE SERVER (CB1-C6) circuit breaker.

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

  2. Do wiring check of the ARINC 429 data bus L-IOC-2 from IAPS connector A4P3, through Junction Box 4, to FSU 1 connector A222P1. Repair/replace as required.

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

  3. Replace FSU 1.
  4. Do close out.

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