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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

03/16/21

Message Overview:

Message Name:

R OB BRAKE CTRL VLV

Message Code:

B3-007830

Associated CAS:

R OUTBD BRAKE FAIL
(Caution)

Reporting LRU: R OB BK CTRL VLV
System Description: 32-43-00
Schematic Diagram: 32-43-00
Wiring Diagram: 32-43-09

Message Description:

The right outboard brake control valve resistance is out of limit (open/short).

Possible Causes:

  • Right Brake Control Valve (BCV) (MPE24)
  • Brake Control Unit (BCU) (A67)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Brake Control Unit AMM 32-43-01-000-801
Installation of the Brake Control Unit AMM 32-43-01-400-801
Removal of the Brake Control Valve AMM 32-43-09-000-801
Installation of the Brake Control Valve AMM 32-43-09-400-801
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 - Electrical Wiring - Continuity Test - Adjustment/Test SPM 20-12-01-05
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

NOTE: If assistance is required, send a download of the BCU NVM to Bombardier CRC for analysis.

  1. Inspect inboard BCV connector and wiring.

    1. Repair as required.
    2. If no fault found, go to next step.

  2. Swap inboard and outboard BCV.

    1. If problem follows, replace BCV.
    2. If problem does not follow, go to next step.

  3. Carry out a wiring check per the following table:

    Connector - BCU Pin Connector - INBD BCV Pin
    A67P1 78 MPE24P1 5
    A67P1 77 MPE24P1 4

    1. Repair wiring as required.
    2. If wiring is found serviceable, go to next step.

  4. Replace BCU.
  5. Do close out.

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