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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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04/01/21

Message Overview:

Message Name:

NO L-IOC-4 BUS INPUT

Message Code:

B3-539892

Associated CAS:

None

Reporting LRU: SVC
System Description: 34-34-00
Schematic Diagram: 34-34-00
Wiring Diagram: 34-34-01

Message Description:

L-IOC-4 bus input to SVC is reported failed while it is not reported missing by both FMCs and Data Link.

Possible Causes:

  • Synthetic Vision Computer (SVC) (A230)
  • Junction Box (JB4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/ Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE: A GPS signal input is required for the SVS image to show on the pilot and the copilot primary flight display (PFD).

Quick Links:

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 Synthetic Vision Computer (SVC) AMM 34-34-01-000-801
Installation of the Synthetic Vision Computer (SVC) AMM 34-34-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset SVS (CB2-A7) circuit breaker.

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

  2. Dowiring check of the ARINC 429 data bus L-IOC-4 from SVC connector A230AP1 to Junction Box 4 connector JB4AP1 or respective Test Point. Repair/replace as required.

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

  3. Replace SVC.

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

  4. Replace Junction Box 4.
  5. Do close out.

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