# SDR CA150714014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 2015
- Submitted: April 22, 2016
- Operation: General aviation
- Make and model: Cessna 172M
- Registry model: [Cessna 172M](https://openairdocs.org/model/cessna-172m) (OpenAirDocs)
- Aircraft time: 3,973 hours
- Engine: Lyc O360A4M
- Propeller: Snsnch 76EM8
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Distributor Gear
- Part number: K3822
- Condition: Damaged
- Location: Magneto
- Part time: 404 hours
- Component: Magneto, Slick
- Component part number: 4371
- Stage of operation: TX
- How discovered: O
- Nature of condition: R, E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA150714014

## Discrepancy

(CAN) ACFT PRE-FLIGHT RUN UP FOUND THE MAGNETO WAS UNSERVICEABLE WHEN SWITCHED TO LT ON SWITCH.  THE ENGINE WOULD COMPLETELY STOP AND WAS RUNNING ROUGH ON BOTH MAGNETO`S. ENGINE WAS O/H 404 HRS BEFORE WITH NEW MAGNETO`S. UPON FURTHER INVESTIGATION IT WAS FOUND THAT THE DISTRIBUTOR GEAR ASSEMBLY`S ELECTRODE HAD BROKEN FREE AND WAS FLOPPING AROUND NOT DOING ANYTHING.

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