# SDR 2026FA0000157

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 4, 2026
- Submitted: March 4, 2026
- Operation: General aviation
- Aircraft: [N4181W](https://openairdocs.org/aircraft/N4181W), registered now
- Make and model: Piper PA-32-300
- Registry model: [Piper PA-32-300](https://openairdocs.org/model/piper-pa-32-300) (OpenAirDocs)
- Aircraft serial: 3240263
- Engine: Lyc IO540K1A5
- Engine time: 1,406 hours
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Dowel Pin
- Condition: Sheared
- Location: Magneto
- Component: Impulse Couplin, Slick
- Component part number: 6351
- Stage of operation: CL
- How discovered: O
- Nature of condition: Y, Z
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000157

## Discrepancy

THE MAGNETO IMPULSE COUPLER LOCKED UP AND BROKE THE GEARS INSIDE THE BACK OF THE ENGINE.  THIS SHEARED THE DOWEL PIN IN THE BACK OF THE CRANKSHAFT CAUSING ENGINE STOPPAGE.

---
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.