# SDR 96ZZZX3460

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 7, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N343AL](https://openairdocs.org/aircraft/N343AL), registered now
- Make and model: Bell 206L-3
- Registry model: [Bell 206L-3](https://openairdocs.org/model/bell-206l-3) (OpenAirDocs)
- Aircraft serial: 51372
- System (JASC): [6230 · Main Rotor Mast/Swashplate](https://openairdocs.org/jasc/6230)
- Part: Nut
- Part number: 206040078103
- Condition: Lost Torque
- Location: Mast Bearing
- Part time: 4,965 hours
- Component: 206040014103
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX3460

## Discrepancy

WHEN REMOVING SWASHPLATE, MECHANIC FOUND NUT TO HAVE LOST TORQUE.  (HAND TIGHT.)  HAVE FOUND SEVERAL MAST NUTS ON 206L-3'S AND 206L-4'S MAST ASSEMBLIES THAT HAVE LOST TORQUE.  BELIEVE THE CONTACT AREA BETWEEN THE MAST NUT AND THE BEARING INNER RACE IS TOO SMALL.  THE 206B AND 206L-1 MAST NUTS HAVE A LARGER CONTACT AREA AND DO NOT CAUSE A PROBLEM.  MODIFY MAST NUT FOR GREATER CONTACT AREA.

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