# SDR 2010FA0001222

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 4, 2010
- Submitted: December 3, 2010
- Operation: General aviation
- Aircraft: [N7347N](https://openairdocs.org/aircraft/N7347N), registered now
- Make and model: Cessna TU206G
- Registry model: [Cessna TU206G](https://openairdocs.org/model/cessna-tu206g) (OpenAirDocs)
- Aircraft serial: U20603624
- Engine: Cont TSIO520M
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Magneto
- Part number: 103493504
- Part serial: K091802
- Condition: Failed
- Location: Left
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2010FA0001222

## Discrepancy

THIS O/H MAGNETO WAS INSTALLED ON THE ACFT IAW MM AND STANDARD PRACTICES, TIMED TO ENG IAW MM.  THE ENGINE WAS RUNUP IAW POH AND THE MAG CHECK WAS SATISFACTORY.  THE ENGINE WAS SHUTDOWN AND COWLING INSTALLED.  AT THE NEXT ENGINE STARE, THE LT MAGNETO FAILED TO FUNCTION, WAS REMOVED AND FOUND TO HAVE A BINDING PROBLEM WITH RESPECT TO ROTATION.  ALSO, THE IMPULSE COUPLING WAS LOCKED UP AND WOULD NOT FUNCTION.  THE MAG DRIVE COUPLING AND RETAINER WERE DAMAGED, CAUSING A SHIFT IN THE TIMING.  EXAMINATION SHOWED A BINDING IN THE ROTATING PARTS OF THE MAGNETO AND A GRINDING SOUND.  THE PART WILL BE RETURNED TO THE SUPPLIER FOR WARRANTY.

---
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.