# SDR 98ZZZX4456

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 1, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N952CC](https://openairdocs.org/aircraft/N952CC), registered now
- Make and model: Cessna 182P
- Registry model: [Cessna 182P](https://openairdocs.org/model/cessna-182p) (OpenAirDocs)
- Aircraft serial: 18263638
- Engine: Cont O470U
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder Head
- Part number: 654650A4
- Condition: Mismanufactured
- Location: Engine
- Part time: 103 hours
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98ZZZX4456

## Discrepancy

DURING A ROUTINE COMPRESSION CHECK, AIR WAS FOUND LEAKING THROUGH A POROUS CASTING IN THE CYLINDER HEADS ON THE NR 2 AND NR 6 CYLINDERS.  BOTH CYLINDERS WERE REPLACED.  SUBMITTER SUGGESTED POSSIBLE CAUSE AS DEFECTIVE CYINDER HEADS INSTALLED ON CYLINDERS AT MANUFACTURE OF THE ENGINE.

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