# SDR 2017FA0000505

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 2, 2017
- Submitted: October 2, 2017
- Operation: General aviation
- Aircraft: [N488DC](https://openairdocs.org/aircraft/N488DC), registered now
- Make and model: Diamon DA20-C1
- Registry model: [Diamon DA20-C1](https://openairdocs.org/model/diamond-aircraft-ind-da20-c1) (OpenAirDocs)
- Aircraft serial: C0188
- Aircraft time: 1,600 hours
- Engine: Cont IO240B
- Engine time: 1,600 hours
- Propeller: Snsnch W69EK63
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Shaft
- Condition: Sheared
- Location: Rt Magneto
- Stage of operation: TX
- How discovered: O
- Nature of condition: C
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2017FA0000505

## Discrepancy

RIGHT MAGNETO SHAFT SHEARED.  INSPECTION REVEALED DAMAGE TO CRANKSHAFT GEAR TEETH AND TO ACCESSORY HOUSING CAUSED BY MAGNETO DRIVE GEAR ASSEMBLY IMPACTING THE TEETH AND CASE. PILOT DID NOT REPORT ANY SIGNIFICANT ISSUES WITH ENGINE PERFORMANCE DURING CRUISE.  A MAGNETO CHECK WAS ACCOMPLISHED PRIOR TO SHUTDOWN AND THE RIGHT MAGNETO DID NOT FUNCTION.  WHEN THE MAGNETO WAS REMOVED BY MAINTENANCE PERSONNEL, THE SHAFT WAS NOTED TO BE SHEARED AND THE GEAR AND CUSHION ASSEMBLY, INTACT, WERE RETRIEVED FROM THE ACCESSORY CASE.  CRANKSHAFT DRIVE GEAR HAS DAMAGE TO SEVERAL TEETH.  TEETH ARE CHIPPED. PHOTOS ARE AVAILABLE. AIRCRAFT/ENGINE IS HANGARED AND AVAILABLE FOR INSPECTION, AS IS AFFECTED MAGNETO AND DRIVE GEAR.

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