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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 LA-RIU-7 BUS OUTPUT

Message Code:

B3-007796

Associated CAS:

None

Reporting LRU: RIU 1
System Description: 23-00-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

LA-RIU-7 is reported missing at L-NAV-VIR/ADF and L-DME.

Possible Causes:

  • Radio Interface Unit (RIU)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 16
  2. Comp Id = A017
  3. Fault Logged = AIR
  4. Status = FAILED/WIRING
  5. {Term Definitions}

    1. DME1-4 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057: 13; NO LA-RIU-7 BUS INPUT
    2. RIU1-26 1X 351 01 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 351: 20; NO L-GP-1 INPU
    3. RIU1-29 1X 351 01 EXCT XXXX-XXXX XTXX-XXXX XXXX-XXXX 351: 23; R-MFD-3 INPUT INACTIVE
    4. NAV1-8 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057V: 13; NO LA-RIU-7 BUS INPUT
    5. NAV1-2 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057A: 13; NO LA-RIU-7 BUS INPUT

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. This message is not a failure if CDU only tuning mode is selected. If not in CDU only mode suspect RIU or wiring problem. GP-1 bus is present at RIU.

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