# SDR CA190304021

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 26, 2019
- Submitted: August 14, 2020
- Operation: General aviation
- Make and model: Bell 429
- Registry model: [Bell 429](https://openairdocs.org/model/bell-helicopter-textron-canada-429) (OpenAirDocs)
- Aircraft time: 3 hours
- System (JASC): [6420 · Tail Rotor Head](https://openairdocs.org/jasc/6420)
- Part: Nut
- Condition: Loose
- Location: Tail Rotor Head
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA190304021

## Discrepancy

(CAN) DURING PRE-FLIGHT CHECK THE TAILROTOR MAST NUT WAS FOUND LOOSE.  AS EVERY MORNING A LICENSED MECHANIC CARRIED OUT THE PRE-FLIGHT CHECK AND FOUND THE DEFECT. IT`S THE SAME MECHANIC WHO CHECKED THE TAIL ROTOR THE DAY BEFORE, AND HE` S 100 PERCENT SURE THAT EVERYTHING WAS OK THE DAY BEFORE. -MAST NUT, RING, RING LOCK AND LOCK WASHER WAS IN PLACE. PLAY WAS DETECTED BETWEEN THE CONE UP TO THE CONE SET. -WHEN TRYING TO DO THE TORQUE CHECK OF THE MAST NUT, WE NOTICED THAT THE NUT COULD BE TIGHTENED BY HAND ONE AND A HALF TURNS. -WHEN REACHING THE TORQUE VALUE, (131-152 NM), EVERYTHING WAS WITHOUT PLAY.

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