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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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03/24/21

Message Overview:

Message Name:

NO LA-RIU-7 BUS INPUT

Message Code:

B3-007253

Associated CAS:

None

Reporting LRU: NAV 1
System Description: 34-51-00
Schematic Diagram: 34-51-00
Wiring Diagram: 34-51-01

Message Description:

LA-RIU-7 data absent at L-NAV-ADF/VIR and NOT absent at L-DME. L-RIU is transmitting data to IOC.

Possible Causes:

  • L NAV-4000 VOR/LOC/GS/MB/ADF Receiver 1 (VHF NAV) (A047)
  • Radio Interface Unit 1 (RIU) (A17)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. ATA Chapter = 34-51
  2. Message# = 5
  3. {Term Definitions}

    1. NAV1-2 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057A: 13;NO LA-RIU-7 BUS INPUT
    2. NAV1-8 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057V: 13;NO LA-RIU-7 BUS INPUT
    3. DME1-4 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 057: 13;NO LA-RIU-7 BUS INPUT
    4. RIU1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;

Quick Links:

Removal of the VHF Navigation Receiver AMM 34-51-01-000-801
Installation of the VHF Navigation Receiver AMM 34-51-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect failed L-NAV input or wiring. Inputs are pin 3, 4.

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