background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults by MDCBy Tips

Select color for CAS message that you wish to troubleshoot

(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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

02/24/21

Message Overview:

Message Name:

VHF 3 INPUT BUS INACTIVE

Message Code:

B3-339594

Associated CAS:

None

Reporting LRU: RIU 1 DATALINK
System Description: 23-00-00
23-51-00
Schematic Diagram: 23-23-00
23-51-00
Wiring Diagram: 23-11-03
23-51-21

Message Description:

VHF 3 input to DATALINK is inactive.

Possible Causes:

  • Third VHF Communication Unit (VHF) 3 (A10)
  • Left Radio Interface Unit (RIU) 1 (A17)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the VHF Communication Unit AMM 23-11-01-000-801
Installation of the VHF Communication Unit AMM 23-11-01-400-801
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. Reset VHF 3 (CB3-E2), RIU 1A (CB1-B5) and RIU 1B (CB1-B4) circuit breakers.

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

  2. Do wiring check of ARINC 429 data bus T-VHF-3 from VHF 3 connector A10P1 to RIU1 connector A17P1. Repair/replace as required.

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

  3. Replace VHF 3.

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

  4. Replace RIU 1.
  5. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.