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

SCU Fault Confirmation Procedure:

NOTE: Before starting any troubleshooting, it is recommended to do a download the SCU Non-Volatile Memory (NVM) and send it to Bombardier Customer Response Center (CRC) for analysis.

SCU Non-Volatile Memory (NVM) Download

  1. Make sure NWS PWR 1 (LCBP-C12) and NWS PWR 2 (RCBP-C12) Circuit Breakers are pushed in.
  2. Make sure the SCU PBA is set to 'OFF' (OFF legend is lighted).
  3. Make sure the Handwheel, Rudder Pedals and Nosewheel are in their neutral position (0°).
  4. Pressurize the left hydraulic system (AMM TASK 29-10-00-862-801).
    NOTE: Always establish Left Hydraulic System Pressure before switching the NWS SYSTEM (NWSS) to 'ON' as it may trigger and record a false 'NWS FAIL' CAS message if any NWSS component is out of its neutral position.
  5. Set the SCU PBA to 'ON' (OFF legend is not lighted).
  6. Wait 30 seconds for PBIT to finish.
  7. Carry out the Operational Test of the Nosewheel-Steering System (AMM TASK 32-51-00-710-801), doing 10 full swings of the steering system using the handwheel and then rudder pedals, or until the ‘NWS FAIL’ caution message is displayed.

    1. If the fault message is not displayed, no maintenance action is required, but:

      1. It is recommended to download the SCU NVM and send it to Bombardier CRC for analysis.
      2. It is recommended to carry out the Rigging of the NWS (AMM TASK 32-51-00-820-801) as it may solve spurious or intermittent faults.

    2. If the 'NWS FAIL' caution message is displayed, record the fault code(s) indicated on the SCU front face 7-segment display.
      Note: If there are multiple codes flashing on the SCU's 7-segment display combined with Fault Code '1', record the codes and troubleshoot them before addressing the Fault Code '1'.
      Note: If Fault Code '7' is flashing with another code, carry out Fault Code '7' troubleshooting before addressing any other fault.

Quick Links:

Automatic Download of the Steering Control Unit (SCU) Non-Volatile Memory (NVM) AMM 32-51-01-970-801
Manual Download of the Steering Control Unit (SCU) Non-Volatile Memory (NVM) AMM 32-51-01-970-802
Operational Test of the Nosewheel-Steering Control System AMM 32-51-00-710-801
Pressurize the Left and Right Hydraulic Systems AMM 29-10-00-862-801
Release Hydraulic Pressure - Left and Right Hydraulic Systems AMM 29-10-00-862-802
Rigging of the Nosewheel-Steering Control System (Preferred Method) AMM 32-51-00-820-801
Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.