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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 LB-RIU-3 BUS OUTPUT

Message Code:

B3-007791

Associated CAS:

None

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

Message Description:

LB-RIU-3 bus absent at L-CPE.

Possible Causes:

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

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 11
  2. Comp Id = A017
  3. Fault Logged = AIR, TAXI
  4. Status = FAILED/WIRING
  5. {Term Definitions}

    1. CPE1-2 XX 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXX-TXXX 057: 12; LEFT B AUDIO BUS FAILURE

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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect failed L-RIU output or wiring.

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