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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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Quick Links

07/02/19

Message Overview:

Message Name:

NO OUTPUT

Message Code:

B3-007784

Associated CAS:

None

Reporting LRU: RIU 1
System Description: 23-51-00
Schematic Diagram: 23-51-00
Wiring Diagram: 23-51-21

Message Description:

L-RIU bus data not received at L-IOC and 3-OF (L-VHF, L-PFD, L-MFD, L-CDU, DCU, L-NAV, L-DME, L-TDR).

Possible Causes:

  • Left Radio Interface Unit (RIU 1)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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 - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset RIU 1A (CB1-B5) and RIU 1B/AURAL (CB1-B4) circuit breaker.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Confirm the presence of the 28 VDC and the ground at the left RIU connectors A17P1 and A17P2. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  3. Replace the left RUI.
  4. Do close out.

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