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

01/28/21

Message Overview:

L INBD BRAKE FAIL
(Caution)

DDG Reference: None
Pilot Action (QRH): GEAR 10-6
System Description: 32-43-00
Schematic Diagram: 32-43-00
Wiring Diagram: 32-43-09

Message Description:

The amber 'L INBD BRAKE FAIL' caution CAS message indicates the left inboard normal system brake has failed. The respective normal brake system has failed, either from a BCV fail, wheel speed transducer fail, hydraulic fuse or shuttle valve.

Possible Causes:

  • Left Inboard Brake Control Valve MPE23 (BCV)
  • Failed the Pressure Pulse Test at power-up or at Gear down
  • Left Inboard Wheel Speed Transducer MT91
  • Left Pilot and Left Co-pilot Brake LVDT
  • Left Inboard Hydraulic Fuse
  • Left Inboard Shuttle Valve

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

  • One failure of the following components on the Left Inboard Brake will trigger an "L INBD BRAKE FAIL" CAS message.

    • Brake Control Valve
    • Wheel Speed Transducer
    • Left Pilot and Left Co-Pilot Brake Linear Variable Differential Transducer (LVDT)
    • Hydraulic Fuse
    • Shuttle Valve

Download the MDC for fault isolation

Download the BCU NVM for the Inboard Channel

Quick Links:

Data Download from the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-802
Removal of the Brake Control Valve AMM 32-43-09-000-801
Installation of the Brake Control Valve AMM 32-43-09-400-801
Removal of the Wheel Speed Transducer AMM 32-43-49-000-801
Installation of the Wheel Speed Transducer AMM 32-43-49-400-801
Removal of the Brake Pedal Position Transducer AMM 32-43-05-000-801
Installation of the Brake Pedal Position Transducer AMM 32-43-05-401-801
Removal of Hydraulic Fuse AMM 32-43-33-000-801
Installation of Hydraulic Fuse AMM 32-43-33-400-801
Removal of Shuttle Valve AMM 32-43-21-000-801
Installation of Shuttle Valve AMM 32-43-21-400-801

Troubleshooting Recommendations:

  1. Verify MDC faults for following messages.

    1. If MDC faults from step 1 are showing, use drop down menu and troubleshoot according to specific B3 code.
    2. If MDC faults from step 1 are not showing, continue with next step.

  2. Pressurize the hydraulic system.
  3. Enter MDC main menu and select system parameters and record pressure using.
  4. Check the Left Inboard brake pressure.
  5. Reset the Left Inboard hydraulic fuse and hold the reset lever at the flow position.
  6. Press the pedal to the fully compressed position.

    1. If the Left Inboard brake pressure is higher than 2640 psi, go to step 8.
    2. If the Left Inboard brake pressure is lower than 2640 psi continue with next step.

  7. Replace the Left Inboard BCV (MPE23), do close out.
  8. Check for external leakage from the Left Inboard hydraulic fuse down to the Left Inboard brake.

    1. If there is no leakage, go to step 10.
    2. If there is leakage, continue with next step.

  9. Replace/Repair the leaking parts, do close out.
  10. Release the Left Inboard hydraulic fuse lever and keep the pedals pressed.

    1. If the L Inbd Brake Fail CAS message reappeared, continue with next step.
    2. If the L Inbd Brake Fail CAS message did not reappear, do close out.

  11. Replace the Left Inboard Shuttle Valve and repeat test from step 4.

    1. If the L Inbd Brake Fail CAS message reappeared, continue with next step.
    2. If the L Inbd Brake Fail CAS message did not reappear, do close out.

  12. Replace the Left Inboard Brake hydraulic Fuse and repeat test from step 4.

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