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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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04/05/21

Message Overview:

Message Name:

NO L-AHC-1 BUS INPUT

Message Code:

B3-650332

Associated CAS:

None

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

Message Description:

No L-AHC-1 data is received at SVC but is not reported failed at L IOC, L FGC and TTR-A.

Possible Causes:

  • Synthetic Vision Computer (SVC) (A230)
  • Config. Connector (J2000)
  • 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 co-pilot primary flight display (PFD).

Quick Links:

Removal of the Synthetic Vision Computer (SVC) AMM 34-34-01-000-801
Removal 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 breakers.

    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-AHC-1 from SVC connector A230AP1 to J2000 Config. Connector. Repair/replace as required.

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

  3. Do wiring check of the internal connection of J2000 Config. Connector.

    1. If system check passes, go to step 5.
    2. If fault remains, continue with next step.

  4. Replace J2000 Config. Connector.

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

  5. Replace SVC.

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

  6. Do close out.

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