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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:

RA-RIU-7 BUS INPUT FAIL

Message Code:

B3-339190

Associated CAS:

None

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

Message Description:

RA-RIU-7 data absent at only one of the R-NAV ADF or VIR inputs. RIU is transmitting data to IOC.

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# = 6
  2. {Term Definitions}

    1. NAV2-8 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057V: 13;NO RA-RIU-7 IN TO VIR
    2. NAV2-2 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057A: 13;NO RA-RIU-7 IN TO ADF
    3. RIU2-1 2X 350 10 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 2X IN
    4. NAV2-2 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057A: 13;NO RA-RIU-7 IN TO ADF
    5. NAV2-8 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057V: 13;NO RA-RIU-7 IN TO VIR
    6. RIU2-1 2X 350 10 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 2X IN

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
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. 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 3 and 4.

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