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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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08/16/19

Message Overview:

Fault Message:

L FDBK LVDT VS R FDBK LVDT/ MISMATCH

Fault Code:

3250006DWY

Associated CAS:

NOSE STEER FAIL
(Caution)

Reporting LRU: Steering Control Unit (SCU)
System Description: 32-51-00
Schematic Diagram: 32-51-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 32-51-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The Nose Wheel Steering Control Unit (SCU) has detected a failure or mismatch with the Position Feedback Linear Variable Differential-Transformers (LVDTs).

Possible Causes:

  • Right Steering Actuator Feedback Position-linear Variable Differential-Transformer (LVDT) (MT16)
  • Left Steering Actuator Feedback Position-linear Variable Differential-Transformer (LVDT) (MT17)
  • Steering Control Unit (SCU) (A36)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

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

Forum Articles/Infoservice/Newsletter: None

The Fault annunciation window in front of the Steering Control Unit (SCU) may be used to identify which part of the system failed.

Quick Links:

Rigging of the Nosewheel-Steering Control System
(Recommended Procedure)		 AMM 32-51-00-820-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Rigging Check of the Nosewheel-Steering Control System AMM 32-51-00-220-801 [ 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 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 ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Re-seat the SCU.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Perform a wiring check between the SCU (A36P1), the LH Steering Actuator LVDT (MT17) and the RH Steering Actuator LVDT (MT16).

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.
      NOTE: While wiring checks are being accomplished have a second person 'shake down' wiring along the top side of the actuators. Inspect wiring on Actuators carefully for extreme bends and kinks or breaks.

  3. Perform the Rigging of the Nosewheel Steering Control System.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  4. Replace the defective Steering Actuators.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  5. Replace the SCU.
  6. Do close out.

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