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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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02/24/21

Message Overview:

Message Name:

NO L RIU CHAN A OUTPUT

Message Code:

B3-411615

Associated CAS:

None

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

Message Description:

LA-RIU-6 bus data not received at L IOC and LA-RIU data is missing at 1 of (CDU 1 or CDU 2). Data Link is installed.

Possible Causes:

  • LA-Radio Interface Unit (RIU) 1 (A17)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 3
  2. Comp Id = A017
  3. Fault Logged = AIR,TAXI
  4. Status = OFF/NO OUTPUT
  5. {Term Definitions}

    1. OPT1-83 XX 360 NA EXCT CSU WD-15 XXXX-XXXX TXXX-XXXX 360-15: 8; RIU/CMU1 DATALINK
    2. IOC1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;
    3. RIU1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;
    4. CDU1-9 1X 350 01 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 350: 18;NO L-RIU-11 IN RX-2 PIN
    5. CDU2-9 2X 350 10 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 350: 18;L-RIU-12 PIN 68,69

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 RB RIU Power or failed RB-RIU-6 bus output or wiring.

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