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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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02/18/21

Message Overview:

Message Name:

NO LB-RIU-8 BUS INPUT

Message Code:

B3-006831

Associated CAS:

None

Reporting LRU: HF 1
System Description: 23-12-00
Schematic Diagram: 23-12-00
Wiring Diagram: 23-12-01
23-51-23

Message Description:

LB-RIU-8 bus data absent at L-HF and NOT absent at L-TDR.

Possible Causes:

  • Left HF Transceiver (HF 1)
  • Junction Box 3 (JB3)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the HF Transceiver AMM 23-12-01-000-801
Installation of HF Transceiver AMM 23-12-01-400-801
Removal of the Radio Interface Unit (RIU) AMM 23-51-21-000-801
Installation of the Radio Interface Unit (RIU) AMM 23-51-21-400-801
Removal of the Junction Box JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
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 HF 1 (CB1-B3) and HF 1 PWR (CB5-A1) circuit breaker.

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

  2. Do wiring check of the ARINC 429 databus LB-RIU-8 from Left RIU connector A17P2, through Junction Box 3, to the HF 1 connector A61P1. Repair/replace as required.

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

  3. Swap HFs.
  4. Do close out.

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