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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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03/26/21

Message Overview:

Message Name:

NO RB-RIU-8 BUS INPUT

Message Code:

B3-008027

Associated CAS:

None

Reporting LRU: TDR 2
System Description: 34-43-00
34-54-00
Schematic Diagram: 34-43-00
34-54-00
Wiring Diagram: 34-43-01
34-54-05

Message Description:

RB-RIU-8 bus data absent at R-TDR. The R-HF is not reporting a failure of the bus.

Possible Causes:

  • Right Air Traffic Control (ATC) Transponder (TDR) (A30)
  • Radio Interface Unit-8 (RIU) (A18)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 8
  2. Comp Id = A030
  3. {Term Definitions}

    1. TDR2-3 2X 350 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 350: 14;NO RB-RIU-8 BUS INPUT
    2. HF2-2 2X 351 10 EXCT XXXX-XXXX XXXX-XXXX XXXX-TXXX 351: 12;NO RB-RIU-8 BUS INPUT
    3. RIU2-26 2X 351 10 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 351: 20;R-GPBUS INACTIVE
    4. OPT1-16 XX 360 NA EXCT CSU WD-03 XXXX-XXXX XXXX-FTTX 10,11,12: HF 2 = 9031

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
Removal of the Air Traffic Control (ATC) Transponder AMM 34-54-01-000-801
Installation of the Air Traffic Control (ATC) Transponder AMM 34-54-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Check RIU-8 input to TDR first. Also suspect failed RB-RIU-8 output or wiring.

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