# SDR 97ZZZX3978

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N9412Z](https://openairdocs.org/aircraft/N9412Z), registered now
- Make and model: Cessna U206G
- Registry model: [Cessna U206G](https://openairdocs.org/model/cessna-u206g) (OpenAirDocs)
- Aircraft serial: 420606473
- Engine: Cont IO520F
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Crankshaft
- Part number: A830M1
- Condition: Failed
- Location: Nr 2 Main Jrnl
- Part time: 1,383 hours
- Stage of operation: NR
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX3978

## Discrepancy

CRANKSHAFT SEPARATED BETWEEN NR 2 ROD BEARING AND NR 2 MAIN BEARING JOURNALS.  FRETTING NOTED ON CASE MATING HALVES.  NR 1 CYLINDER WAS PREVIOUSLY REMOVED AND REPLACED APPROXIMATELY 555 HOURS BEFORE FAILURE OF CRANK.  NR 2 MAIN BEARING HAD SHOWED SIGNS OF SPINNING.

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