# SDR 97ZZZX1278

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 6, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N407AL](https://openairdocs.org/aircraft/N407AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53044
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Hanger Support
- Condition: Loose
- Location: Nr 4 T/R Brg
- Component: 407040302101
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX1278

## Discrepancy

DURING A 50-HOUR INSPECTION, THE NR 4 T/R BEARING HANGER SUPPORT WAS FOUND LOOSE FLOATING UP AND DOWN ON THE ATTACH BOLT.  NR 7 HANGER SUPPORT WAS FOUND TO BE MAKING MUD AT CONTACT AREA WITH TAILBOOM BRACKET.  FOUND ATTACH BOLT P/N NAS6604D65 WORN AND STEPPED ON NR 4 SHAFT AND ONLY SLIGHTLY WORN ON NR 7 SHAFT.  THE 407 MM REQUIRES TORQUE OF 50-70 INCHES/POUNDS.  NEITHER CHAPTER 65 OR PARAGRAPHS 1-13 TORQUES STATE WHETHER OR NOT NUT DRAG SHOULD BE FACTORED IN.  ALSO, DRAWING IN THE TAILBOOM BRACKET WILL EFFECT THE FINAL TORQUE.

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