# SDR KC2R2014091049320

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 10, 2014
- Submitted: September 10, 2014
- Operation: General aviation
- Aircraft: [N2019X](https://openairdocs.org/aircraft/N2019X), registered now
- Make and model: Cessna 182H
- Registry model: [Cessna 182H](https://openairdocs.org/model/cessna-182h) (OpenAirDocs)
- Aircraft serial: 18256119
- Engine: Cont O470R
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Impulse Coupling
- Part number: M3050
- Condition: Cracked
- Location: Magneto
- Part time: 1,000 hours
- Component: Magneto, Slick, 6310
- Component part number: 6310
- Stage of operation: IN
- How discovered: M
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/KC2R2014091049320

## Discrepancy

DURING A 500 HOUR INSPECTION OF MAGNETOS, IMPULSE COUPLING WAS FOUND TO HAVE CRACKS IN THE HUB BASE PLATE, LOCATED AT THE FULL ADVANCE STOP NOTCH.  CRACKS RADIATE FROM THE SHARP-CORNERED FEATURE OF THE NOTCH OF THE PLATE.  DEFECT DETECTED USING MAGNETIC PARTICLE NDT TESTING.  WE HAVE SEEN THIS SAME DEFECT ON A LARGE PERCENTAGE OF SLICK MAGS USED ON THE 6 CYLINDER ENGINES.

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