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

03/16/21

Message Overview:

Message Name:

NO R-GP-4 A429 TO OB BCU

Message Code:

B3-224426

Associated CAS:

BRAKE FAULT
(Advisory)

Reporting LRU: BRAKE CTRL UNIT
System Description: 32-43-00
Schematic Diagram: 32-43-00
Wiring Diagram: 32-43-01

Message Description:

The outboard card of the BCU does not receive ARINC 429 bus from the R-IOC.

Possible Causes:

  • Right Input/Output Concentrator Unit (IOC) No. 2 (A4-IOC2)
  • Brake Control Unit (BCU) (A67)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
Removal of the Brake Control Unit AMM 32-43-01-000-801
Installation of the Brake Control Unit AMM 32-43-01-400-801
Data Download from the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset LCBP-C15, RCBP-C15 (Inbd and Outbd BCU) and RCBP-B6 (R IAPS).
  2. Verify if 'BRAKE FAULT' CAS message is still posted.

    1. If 'BRAKE FAULT' CAS message not posted, do close out.
    2. If 'BRAKE FAULT' CAS message is posted, continue with next step.

  3. Verify if 'NO R-GP-4 A429 TO IB BCU' (B3-224424) is also shown.

    1. If 'NO R-GP-4 A429 TO IB BCU' (B3-224424) not shown, replace BCU.
    2. If 'NO R-GP-4 A429 TO IB BCU' (B3-224424) is also shown, go to next step.

  4. Swap the Left IOC with the Right IOC.

    1. If 'BRAKE FAULT' CAS message not posted, replace IOC card.
    2. If 'BRAKE FAULT' CAS message is posted, replace BCU.

  5. Do close out.

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