# SDR CA121106004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 6, 2012
- Submitted: September 14, 2015
- Operation: General aviation
- Make and model: Piper PA-44-180
- Registry model: [Piper PA-44-180](https://openairdocs.org/model/piper-pa-44-180) (OpenAirDocs)
- Engine: Lyc LO360A1H6
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Rotor
- Part number: M35123
- Condition: Sheared
- Location: Magneto
- Part time: 1,848 hours
- Stage of operation: TX
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA121106004

## Discrepancy

(CAN) PILOTS EXPERIENCED A ROUGH RUNNING MAGNETO DURING A GROUND RUN UP WHICH CHANGED TO A DEAD MAG. UPON RETURNING TO BASE MAINTENANCE REMOVED THE MAGNETO AND FOUND THAT THE MAIN ROTOR SHAFT WHERE THE ROTOR GEAR M3827 MOUNTS ONTO THE SHAFT WAS SHEARED OFF.

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