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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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04/05/21

Message Overview:

Message Name:

NO L-RIU-12 BUS INPUT

Message Code:

B3-648643

Associated CAS:

None

Reporting LRU: FMC 2
System Description: 34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 34-61-05

Message Description:

L-RIU-12 bus absent at R-FMC 6200 and not R-CDU, R-CDU strapped in and not at R IOC. Datalink is installed.

Possible Causes:

  • Left Radio Interface Unit (RIU) (A17)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-34-0189 - Pro Line 21 Advanced Avionics Nuisance Messages and FMS-6200 Issues
    Challenger 350 (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

NOTE: This nuisance message is caused by the FMS-6200 software.
Work Around: Switching to the map function for the Right and/or Left PFD should clear this message.

Quick Links:

Removal of the Junction Box JB2 AMM 24-63-05-000-803
Installation of the Junction Box JB2 AMM 24-63-05-400-803
Removal of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-000-801
Installation of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-400-801
Removal of the Adaptive Flight-Display Unit AMM 31-61-01-000-801
Installation of the Adaptive Flight-Display Unit AMM 31-61-01-400-801
Removal of the Flight Management Computer (FMC) AMM 34-61-01-000-801
Installation of the Flight Management Computer (FMC) AMM 34-61-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect failed L-RIU- 12 input or wiring.
    OPT1-83 AND OPT1-33 AND OPT2-1 AND FMC2-5 AND NOT DLNK-10 AND NOT CDU2-9 AND NOT DLNK-9 AND NOT CDU2-1.

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