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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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03/10/21

Message Overview:

Message Name:

NGDNLK SCU OVLD FAULT

Message Code:

B3-006636

Associated CAS:

None

Reporting LRU: SCU; NGDNLK
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-51-01
32-61-09

Message Description:

Proximity Sensor Electronic Unit (PSEU) detects an overload condition on the discrete output to the Steering Control Unit.

Possible Causes:

  • Steering Control Unit (SCU) (A73)
  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Functional Test of the Nose Wheel Steering Control AMM 32-51-00-720-801
Removal of the Steering Control Unit AMM 32-51-01-000-801
Installation of the Steering Control Unit AMM 32-51-01-400-801
Removal of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-000-801
Installation of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-400-801
Functional Test of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-720-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Do wiring check from the Steering Control Unit connector A73P1 Pin G to the PSEU connector A9CP1 Pin 8A. Repair as required.

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

  2. Replace the Steering Control Unit.

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

  3. Replace the Proximity Sensor Electronic Unit.
  4. Do close out.

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