# SDR 97ZZZX4906

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 30, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N437AL](https://openairdocs.org/aircraft/N437AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53141
- System (JASC): [6500 · Tail Rotor Drive System](https://openairdocs.org/jasc/6500)
- Part: Mast Nut
- Part number: 406017113101
- Condition: Loose
- Location: T/R
- Component: 407012100101
- 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/97ZZZX4906

## Discrepancy

DAILY INSPECTION FOUND COMPLETE LOSS OF TORQUE ON T/R MAST NUT.  THE NUT COULD BE REMOVED BY HAND.  THE SAFETY WIRE BETWEEN THE NUT AND THE SUPPORT, (P/N 407-012-106-103) KEPT THE NUT FROM SPINNING OFF OF THE TAIL ROTOR GEARBOX OUTPUT SHAFT.

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