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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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03/30/21

Message Overview:

Message Name:

RB-RIU-7 BUS INPUT FAIL

Message Code:

B3-339200

Associated CAS:

None

Reporting LRU: NAV 2
System Description: 34-51-00
Schematic Diagram: 34-51-00
Wiring Diagram: 34-51-05

Message Description:

RB-RIU-7data absent at only one of the R-NAV ADF or VIR inputs.

Possible Causes:

  • VHF Navigation Receiver 2 (NAV) (A48)
  • Radio Interface Unit 1 (RIU) (A17)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 8
  2. Comp Id = A048
  3. {Term Definitions}

    1. NAV2-9 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057V: 14;NO RB-RIU-7 IN TO VIR
    2. NAV2-3 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057A: 14;NO RB-RIU-7 IN TO ADF
    3. NAV2-3 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057A: 14;NO RB-RIU-7 IN TO ADF
    4. NAV2-9 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057V: 14;NO RB-RIU-7 IN TO VIR

Quick Links:

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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect failed R-NAV input or wiring. If ADF capability is not installed then the failure may be in the RIU or bus wiring. Input pins are 21 and 22.

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