# SDR 97ZZZX4710

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Classic Service Center LLC, repair station KBTR482F](https://openairdocs.org/faa-repair-station/KBTR482F/classic-service-center-llc.md) (OpenAirDocs)
- Aircraft: N55TV
- Make and model: Bell 206B-3
- Registry model: [Bell 206B-3](https://openairdocs.org/model/bell-helicopter-textron-206b-3) (OpenAirDocs)
- Aircraft serial: 3788
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Gearshaft
- Part number: 206040040005
- Condition: Worn
- Location: Xmsn Splines
- Part time: 2,997 hours
- 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/97ZZZX4710

## Discrepancy

TRANSMISSION GEARSHAFT SPLINES SEVERLY WORN.  SUSPECT CAUSE DUE TO LENGTH OF CALENDAR TIME INSTALLED INDICATING BREAKDOWN OF THE LUBRICANT.  PERIOD OF INSTALLATION WAS 13 YEARS.  RECOMMEND A CALENDAR LIMITATION OF 4 YEARS AS WELL AS THE EXISTING HOURLY FREQUENCY (TO SUNGEAR).

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