# SDR 2002FA0000054

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 14, 2002
- Submitted: January 17, 2002
- Operation: General aviation
- Aircraft: [N85664](https://openairdocs.org/aircraft/N85664), registered now
- Make and model: Bbavia 7AC
- Aircraft serial: 7AC4409
- Engine: Lyc IO320C1A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 32000WLA1
- Part serial: 018
- Condition: Cut
- Location: Engine
- Stage of operation: IN
- How discovered: V
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002FA0000054

## Discrepancy

ENGINE WAS INSTALLED ON THE AIRCRAFT AND RUN UP.   AN OIL LEAK WAS NOTICED IN THE LOWER SPARK PLUG BOSS AREA OF NR 1 CYLINDER.  FURTHER EXAMINATION REVEALED THAT SOME CUTS BETWEEN FINS ADJACENT TO THE SPARK PLUG HOLE NEARLY PENETRATED THE THREAD AREA OF THE SPARK PLUG HOLE.  CYLINDER NR 2 HAD A SIMILAR PROBLEM BUT THE CUTS ONLY PENETRATED HALFWAY THROUGH THE BOSS SURFACE.

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