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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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Quick Links

08/17/19

Message Overview:

Fault Message:

3A/3B AC ELEC HYD PUMP PRESS SWITCH#2/ WIRING

Fault Code:

3250015DWY

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 Steering Control Unit (SCU) detected that there is no pressure at the 3 Hydraulic Pressure Switches when the NWS system is armed and pressure is sensed at the Nose Wheel Steering (NWS) Pressure Switch 1.

Possible Causes:

  • Hydraulic AC Motor Pump 3A Pressure Switch (S39)
  • Hydraulic AC Motor Pump 3B Pressure Switch (S40)
  • Steering Solenoid Valve (SSV) (L1)
  • Steering Control Unit (SCU) (A36)
  • Junction Box 4 (JB4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-32-0280 - Nose Wheel Steering -Troubleshooting 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:

Removal of the Junction Box JB4 AMM 24-00-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB4 AMM 24-00-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Junction Box JB4 Circuit-Cards AMM 24-00-06-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB4 Circuit-Cards AMM 24-00-06-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Hydraulic Pressure Switches AMM 29-31-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Hydraulic Pressure Switches AMM 29-31-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
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 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 ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Set Hydraulic System switches 3A and 3B to ON.
  2. Set Nose Steer switch to ARMED.

    1. If the NOSE STEER FAIL (amber) message is not shown on EICAS, go to step 5.
    2. If the NOSE STEER FAIL (amber) message is shown on EICAS, continue with next step.

  3. Perform a wiring check between the Hydraulic system 3B Pressure switch (S40) and the SCU (A36).

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, replace the Solenoid Selector Valve and continue with next step.

  4. Perform a wiring check between the Solenoid Selector Valve connector (L1P1) and the SCU (A36).

    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.

  5. Set the Hydraulic system switch 3A to OFF.

    1. If the NOSE STEER FAIL (amber) message is not shown on EICAS, go to step 8.
    2. If the NOSE STEER FAIL (amber) message is shown on EICAS, continue with next step.

  6. Perform a wiring check between the Hydraulic system 3B Pressure switch (S40) and the SCU (A36).

    1. If wiring checks are not good, repair defective wiring as required and go to step 10.
    2. If wiring checks are good, replace the Hydraulic system 3B Pressure switch (S40) and continue with next step.

  7. Set the Hydraulic system switch 3A to ON.
  8. Set the Hydraulic system switch 3B to OFF.
  9. Perform a continuity check between the Hydraulic system 3A Pressure switch wiring (S39) and the SCU (A36).

    1. If there is continuity, replace the Hydraulic system 3A Pressure switch (S39) and do close out.
    2. If there is no continuity, repair defective wiring as required and continue with next step.

  10. Replace JB4/PCB3.

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

  11. Check if the NOSE STEER FAIL (amber) message is still shown on EICAS.

    1. If the NOSE STEER FAIL (amber) message is not shown on EICAS, monitor for failure and do close out.
    2. If the NOSE STEER FAIL (amber) message is shown on EICAS, continue with next step.

  12. Replace SCU.
  13. Do close out.

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