# SDR CA130513014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 7, 2013
- Submitted: September 14, 2015
- Operation: General aviation
- Make and model: Bell 206B
- Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (OpenAirDocs)
- Aircraft time: 17,771 hours
- Engine: Allsn 250C20B
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Coupling
- Part number: 206040118001
- Condition: Damaged
- Location: T/R Drive Shaft
- Part time: 9,061 hours
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA130513014

## Discrepancy

(CAN) DURING THE 100/300/600 HOUR INSPECTION AN ANOMALY WAS FOUND ON THE MAIN DRIVESHAFT COUPLING.  1 FLANGE INNER SURFACE APPEARS TO HAVE BEEN TURNED DOWN ON A LATHE SO THAT IT IS APPROXIMATELY 0.050" THINNER THAN THE FLANGE ON THE OPPOSITE END OF THE COUPLING.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.