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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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04/26/21

Message Overview:

Message Name:

UNABLE TO RIG RVT

Identifier: 325OBS003
Effectivity: AIRCRAFT 20501 - 20999
System: Nosewheel Steering
Associated CAS: None
System Description: 32-51-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

After completing task 32-51-05-820-802, Calibration of the Hand Wheel or task 32-51-00-820-801 Rigging of the NWSS, code 7 is flashing on the SCU 7-segment display.

Possible Causes:

  • Nose Wheel Feedback Mechanism
  • Nose Wheel Steering Indicator shifted left or right
  • Rotary Variable Transducer (RVT)
  • Steering Control Unit (SCU)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:None
Forum Articles/Infoservice/Newsletter:None

Quick Links:

Lifting of the Complete Aircraft with Jacks AMM 07-10-01-582-801
Lowering of the Complete Aircraft AMM 07-10-01-586-801
Operational Test of the Nosewheel-Steering Control System AMM 32-51-00-710-801
Functional Test of the Nosewheel-Steering Control AMM 32-51-00-720-801
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
Rigging of the Nosewheel-Steering Control System (Alternate Method) AMM 32-51-00-820-803
Automatic Download of the Steering Control Unit (SCU) Non-Volatile Memory (NVM) AMM 32-51-01-970-801
Manual Download of the Steering Control Unit (SCU) Non-Volatile Memory (NVM) AMM 32-51-01-970-802
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 Steering Control Handwheel AMM 32-51-05-000-801
Installation of the Steering Control Handwheel AMM 32-51-05-400-801
Calibration of the Steering Control Handwheel (Preferred Method) AMM 32-51-05-820-802
Calibration of the Steering Control Handwheel (Alternate Method) AMM 32-51-05-820-803
Removal of the Steering Selector Valve AMM 32-51-09-000-801
Installation of the Steering Selector Valve AMM 32-51-09-400-801
Operational Test of the Steering Selector Valve AMM 32-51-09-710-801
Removal of the Steering Manifold AMM 32-51-13-000-801
Installation of the Steering Manifold AMM 32-51-13-400-801
Installation of the Rotary Variable Transducer AMM 32-51-29-400-801
Rigging of the Rotary Variable Transducer (Preferred Method) AMM 32-51-29-820-802
Rigging of the Rotary Variable Transducer (Alternate Method) AMM 32-51-29-820-803
Put the Aircraft in a Weight-Off-Wheel Configuration with the Aircraft on the Ground AMM 32-61-00-867-801
Remove the Aircraft from a Weight-Off-Wheel Configuration with the Aircraft on the Ground AMM 32-61-00-867-802
Put the Aircraft in a Weight-On-Wheel Configuration with the Aircraft on Jacks AMM 32-61-00-867-803
Remove the Aircraft from a Weight-On-Wheel Configuration with the Aircraft on Jacks AMM 32-61-00-867-804
Operational Test of the Proximity Sensors AMM 32-61-00-710-801
Functional Test of the Proximity Sensors AMM 32-61-00-720-801
Adjustment of the Proximity Sensors AMM 32-61-00-820-801
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Verify the Steering Feedback link for any play.

    1. If there is play, disconnect the steering Feedback link to isolate the play.
    2. Replace any component that has play.
      NOTE: The tapered pin can be swagged to eliminate play on the lever.
    3. Redo the rigging of the RVT.

  2. If there is no play, continue with next step.
  3. Jack the aircraft.
  4. Put the aircraft in a Weight-on-Wheel configuration.

    1. Verify if the Nose Steering Indicator aligns with the 0° position on the nose wheel position placard.
    2. If the steering indicator aligns with the 0° position, continue with next step, if it does not align go to step 6.

  5. On the RVT receptacle.

    1. Verify wiring between pins 1 and 2 also pins 3 and 4.
    2. Resistance should be between 127 Ω to 154 Ω.
    3. Verify wiring between pins 5 and 8 also pins 6 and 7.
    4. Resistance should be between 180 Ω to 218 Ω.
    5. If resistance value are not within tolerances.
    6. Replace RVT.
    7. After replacement of RVT go to step 9.

  6. If the steering indicator does not align with the 0° position.

    1. Mark the new position of the 0° on the Nose Steering Indicator.

  7. Remove the aircraft from the Weight-On-Wheel configuration.
  8. Lower the aircraft on ground.
  9. Carry out task 32-51-29-820-802 Rigging of the RVT or task 32-51-00-820-801 Rigging of the NWSS or task 32-51-00-820-802 Bias correction of the Steering, depending on the task to be carried out.

    1. If code 7 still showing on the 7-segment display of the SCU.
    2. Replace SCU.

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