# SDR KC2R2014FA0000437

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 7, 2014
- Submitted: July 18, 2014
- Operation: General aviation
- Aircraft: [N351HC](https://openairdocs.org/aircraft/N351HC), registered now
- Make and model: Cessna 414A
- Registry model: [Cessna 414A](https://openairdocs.org/model/cessna-414a) (OpenAirDocs)
- Aircraft serial: 414A0801
- Engine: Cont TSIO520N
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Impulse Coupling
- Part number: M3050
- Condition: Cracked
- Location: Magneto
- Part time: 491 hours
- Component: Magneto, Slick
- Component part number: 6320
- 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/KC2R2014FA0000437

## Discrepancy

DURING PERFORMANCE OF FIRST 500 HR INSPECTION OF MAGNETO, CRACKS WERE DISCOVERED IN IMULSE COUPLING SHELL.  CRACKS DETECTED BY NDT/MAGNETIC PARTICLE INSPECTION OF PARTS.  CRACKS RADIATE FROM SHARP CORNERED FEATURE OF SHELL THAT FORMS TRIP DOGS.  SUSPECT STRESS RISERS CREATED AT SHARP COMERS RESULTED IN CRACKS.  ALL 4 MAGNETOS FROM  THIS ACFT HAD SAME DEFECT PRESENT, REQUIRING REPLACEMENT OF IMPULSE COUPLING ASSEMBLY.

---
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.