# SDR 2011FA0000099

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 2011
- Submitted: February 11, 2011
- Operation: General aviation
- Aircraft: [N99KE](https://openairdocs.org/aircraft/N99KE), registered now
- Make and model: Cirrus SR22
- Registry model: [Cirrus SR22](https://openairdocs.org/model/cirrus-design-sr22) (OpenAirDocs)
- Aircraft serial: 2303
- Engine: Cont IO550N
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Gear
- Part number: 656991
- Condition: Fractured
- Location: Crankshaft
- Part time: 432 hours
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2011FA0000099

## Discrepancy

WHILE THE ACFT WAS IN FOR MX, WHILE ATTEMPTING TO START THE ENGINE, A METAL GRINDING NOISE WAS HEARD BY THE MECHANIC.  SUBSEQUENT REMOVAL OF THE STARTER ADAPTER REVEALED AT LEAST 2 TEETH MISSING ON THE CRANKSHAFT GEAR AND MARRED TEETH ON THE ADAPTER.  THIS CONSTITUTES AND INTERNAL ENGINE FAILURE.  THE THEORY IS THAT THE STARTER INDUCED A STRESS FATIGUE FRACTURE ON THE CRANKSHAFT GEAR.

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