# SDR 2GYR20200918911

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 18, 2020
- Submitted: September 18, 2020
- Operation: General aviation
- Aircraft: [N911YY](https://openairdocs.org/aircraft/N911YY), registered now
- Make and model: Bell 206L-4
- Registry model: [Bell 206L-4](https://openairdocs.org/model/bell-helicopter-textron-canada-206l-4) (OpenAirDocs)
- Aircraft serial: 52047
- Aircraft time: 12,268 hours
- System (JASC): [6230 · Main Rotor Mast/Swashplate](https://openairdocs.org/jasc/6230)
- Part: Nut
- Part number: 206040078101
- Condition: Undertorqued
- Location: Mast
- Part time: 12,268 hours
- Component: Mast Assembly, Bell
- Component part number: 206040014107
- Stage of operation: IN
- How discovered: V
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2GYR20200918911

## Discrepancy

WE REMOVED MAST ASSY P/N 206-040-014-107 S/N 52047 TO REPAIR A LEAKING MAST BEARING SEAL.  WHEN REMOVAL OF MAST NUT P/N 206-040-078-101 WAS ATTEMPTED IT WAS FOUND TO BE IMPROPERLY TORQUED.  NUT WAS APPROXIMATELY HAND TIGHT AND NOT TO SPECS OF  500-550 FT-LBS.  NO DISRUPTION OF SAFETY LOCK OR SEALANT ON LOCK FOUND.

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