# SDR 99ZZZX2929

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 8, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N737YS](https://openairdocs.org/aircraft/N737YS), registered now
- Make and model: Cessna 172N
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (OpenAirDocs)
- Aircraft serial: 17269783
- Engine: Lyc O360A4A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: CLASS12
- Condition: Cracked
- Location: Engine
- 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/99ZZZX2929

## Discrepancy

THIS NR 4 CYLINDER WAS REMOVED BECAUSE OF A  VERY LARGE CRACK AROUND THE TOP OF THE HEAD.  THIS AND 2 OTHER CYLINDERS WERE REMOVED AND REPAIRED AT 183.0 TSO BECAUSE OF LOOSE VALVE GUIDES AND SEAL TROUBLES.  NOW HAS 1,038.9 TSO HOURS AND A CRACKED HEAD.

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