# SDR CA051111003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 11, 2005
- Submitted: December 2, 2005
- Operation: General aviation
- Make and model: Cessna 207
- Registry model: [Cessna 207](https://openairdocs.org/model/cessna-207) (OpenAirDocs)
- Aircraft time: 9,638 hours
- Engine: Cont IO550F
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: TIST760CA
- Condition: Cracked
- Location: Engine
- Component: Engine, Cont, IO550F
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA051111003

## Discrepancy

(CAN) CYLINDER NR 4 HAD LARGE CRACK ACROSS CYLINDER, BELOW TOP SPARK PLUG HOLE. A CYLINDER DIFFERENTIAL CHECK CONFIRMED CYLINDERS 2, 6, AND 3 TO HAVE CRACKS IN THE SAME GENERAL LOCATION.  ALL 6 CYLINDER ASSEMBLIES WHERE REMOVED.  6 NEW CYLINDER ASSEMBLIES P/N 655471A4.  NOTE: THIS MAKES 16 I0-520 AND I0-550 CYLINDER ASSEMBLIES REPLACED DUE TO THE SAME PROBLEM SINCE MAY 2005 ON A FLEET OF 6 AC OPERATED BY 2 INDEPENDENT COMPANYS.

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