# SDR 97ZZZX2045

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N4820H](https://openairdocs.org/aircraft/N4820H), registered now
- Make and model: Piper PA-17
- Registry model: [Piper PA-17](https://openairdocs.org/model/piper-pa-17) (OpenAirDocs)
- Aircraft serial: 17118
- Engine: Cont A658
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Crankshaft
- Part number: 530196A1
- Condition: Fractured
- Location: Nr 2 Throw
- Part time: 109 hours
- Stage of operation: NR
- Nature of condition: Y
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX2045

## Discrepancy

CRANKSHAFT FRACTURED IN AFT CHEEK OF NR 2 THROW CAUSING ENGINE TO STOP.  THE CRANKSHAFT WAS IN THE 0.010 INCH UNDER CONDITION.  THE ORIGIN OF THE FRACTURE MAY HAVE BEEN THE AFT RADIUS OF THE NR 2 CRANK PIN.  THE CRANKSHAFT WAS MAGNAFLUXED AT OVERHAUL.  SUBMITTER RECOMMENDS MAKING ULTRASONIC INSPECTION AN OVERHAUL REQUIREMENT ON AGING ENGINES.

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