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

04/26/21

Message Overview:

Message Name:

AIRCRAFT PULLS TO ONE SIDE

Identifier: 325OBS001
Effectivity: AIRCRAFT 20501 - 20999
System: Nosewheel Steering
System Description: 32-51-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

A tendency of the aircraft to veer to one side without steering input.

Possible Causes:

  • Tire Pressure
  • Brake Unit
  • Wheel Bearing
  • NWS Rigging
  • Nosewheel Feedback Rotary Variable Transducer (RVT)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Troubleshooting Tips:

Quick Links:

Lifting of the Complete Aircraft with Jacks AMM 07-10-01-582-801
Rigging of the Nosewheel-Steering Control System (Preferred Method) AMM 32-51-00-820-801
Bias Correction of the Nosewheel-Steering Control AMM 32-51-00-820-802
Servicing of the Tires AMM 12-15-00-614-801
Pressure Check of the Tires AMM 12-15-00-780-802
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Check that the tire pressures are within limits (AMM TASK 12-15-00-780-802).
  2. Do a general visual inspection of the main and nose landing gear tires.
  3. Lift the complete aircraft with jacks.
  4. Make sure that each main landing-gear wheel assembly turns smoothly with light drag.

    1. If a wheel assembly does not turn smoothly, examine the wheel assembly bearings and the brake unit for defects.
    2. If No Fault Found, go to the next step.

  5. Make sure that each nose landing-gear wheel assembly turns smoothly with light drag.

    1. If one of the nose landing-gear wheel assemblies does not turn smoothly or shows more than usual drag, examine the wheel assembly bearings.
    2. If No Fault Found, go to the next step.

  6. Verify the steering feedback (RVT) linkage mechanism for play or for jamming.

    1. If play is found, or if the mechanism is jammed, replace parts as required and carry out the Rigging of the Nosewheel-Steering Control System (AMM TASK 32-51-00-820-801).
    2. If No Fault Found, go to the next step.

  7. Verify that the Nosewheel Steering Indicator aligns with the 0° position on the nosewheel position placard.

    1. If the steering indicator does not align with the 0° position, the placard may have shifted. Mark the new position of the 0° on the Nosewheel position placard and carry out the Rigging of the Nosewheel-Steering Control System (AMM TASK 32-51-00-820-801).
    2. If No Fault Found, go to the next step.

  8. Carry out the Rigging of the Nosewheel-Steering Control System (AMM TASK 32-51-00-820-801).

    1. If fault continues, carry out the Bias Correction of the Nosewheel-Steering Control System (AMM TASK 32-51-00-820-802).
      NOTE: If SCU Fault Code '7' is showing the SCU 7-segment display after performing the Bias Correction procedure, redo the procedure and verify that FDBK 1 and FDBK 2 voltage is not over -0.050V or +0.050V before removing the RIG TRIG jumper. If not, pull back the nosewheel until voltage is just below 0.050V and then remove the RIG TRIG jumper wire.

  9. Replace RVT.
  10. Do close out.

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