background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults By CAIMS By 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

03/28/25

Message Overview:

NOSE STEER FAIL
(Caution)

DDG Reference: 32-50-01
Pilot Action (QRH): ABNORM 13-7
System Description: 32-50-00 - Steering
Schematic Diagram: 32-51-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 32-51-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

There is a failure of the Nose Wheel Steering control system.

Possible Causes:

  • Steering Control Handwheel (MT2)
  • Steering Pressure Switch (S2)
  • Landing Gear Selector Valve 3 (L17)
  • Rudder Control RVDT (MT219)
  • Steering Solenoid Valve (SSV) (L1)
  • Electro-Hydraulic Servo Valve (EHSV) (L12)
  • Steering Actuator Feedback Position LVDT (MT16)
  • Steering Actuator Feedback Position LVDT (MT17)
  • Nose Wheel Steering System Rigging Fault
  • Steering Control Unit (SCU) (A36)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-32-0280 - Nose Wheel Steering - Troubleshooting SCU GW415-8100-3

Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

  • Check Nose Wheel Steering Rigging Status for Proximity Sensor faults prior to performing Troubleshooting Recommendations.
  • The NOSE STEER SWITCH in the cockpit has multiple contacts. A failed contact set could cause the system to indicate a fault. The NOSE STEER FAIL CAS message could be accompanied with "-" displayed on the SCU seven segment display.

Quick Links:

Rigging of the Nosewheel-Steering Control System AMM 32-51-00-820-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Steering Control Unit AMM 32-51-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Steering Control Unit AMM 32-51-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Steering Control Handwheel AMM 32-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Steering Control Handwheel AMM 32-51-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Rudder-Control Rotary-Variable Differential-Transducer (RVDT) AMM 32-51-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Rudder-Control Rotary-Variable Differential-Transducer (RVDT) AMM 32-51-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Steering Solenoid Valve AMM 32-51-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Steering Solenoid Valve AMM 32-51-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Steering Manifold AMM 32-51-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Steering Manifold AMM 32-51-17-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Steering Actuator AMM 32-51-21-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Steering Actuator AMM 32-51-21-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Steering Pressure Switch AMM 32-51-29-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Steering Pressure Switch AMM 32-51-29-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

NOTE: Check Nose Wheel Steering Rigging Status for Proximity Sensor faults prior to performing Troubleshooting Recommendations.

NOTE: The NOSE STEER SWITCH in the cockpit has multiple contacts. A failed contact set could cause the system to indicate a fault. The NOSE STEER FAIL CAS message could be accompanied with '-' displayed on the SCU seven segment display. See step 3 for a continuity check on the switch contacts.

  1. Access CAIMS Active Faults.
  2. Select related CAIMS message below.
  3. Remove the Landing Gear Control Panel (AP22). Perform a continuity check directly on the NOSE STEER switch contacts as follows:
    NOSE STEER SWITCH in the 'OFF' position

    From To Expected Result Result
    1C 1NC (No wire connected) Continuity
    1C 1NO Open
    2C 2NC(No wire connected) Continuity
    2C 2NO Open
    3C (Unused) 3NC (Unused) Open
    3C (Unused) 3NO (Unused) Continuity
    4C 4NC(No wire connected) Open
    4C 4NO Continuity

    NOSE STEER SWITCH in the 'ARM' position

    From To Expected Result Result
    1C 1NC (No wire connected) Open
    1C 1NO Continuity
    2C 2NC(No wire connected) Open
    2C 2NO Continuity
    3C (Unused) 3NC (Unused) Continuity
    3C (Unused) 3NO (Unused) Open
    4C 4NC(No wire connected) Continuity
    4C 4NO Open

    1. If the continuity check results agree with the tables above, continue with next step
    2. If the continuity check results do not agree with the tables above, replace the NOSE STEER Switch

  4. If there is no CAIMS message available please follow the 'Troubleshooting Recommendations' steps on the 'GEAR DISAGREE' page.

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