# SDR 96ZZZX5226

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 26, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N737FP
- Make and model: Cessna 172N
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (OpenAirDocs)
- Aircraft serial: 17269385
- Engine: Lyc O320H2AD
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Part number: 74541
- Condition: Stem Failed
- Location: Nr 3 Cyl Exh
- Part time: 1,855 hours
- Stage of operation: NR
- Nature of condition: E, R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX5226

## Discrepancy

PRECAUTIONARY LANDING MADE DUE TO POWER LOSS AND FLUCTUATING OIL PRESSURE.  ENGINE WOULD MAINTAIN 1,800 RPM, AT FULL THROTTLE.  NR 3 CYLINDER EXHAUST VALVE FAILED JUST ABOVE HEAD/STEM RADIUS.  SECONDARY CYLINDER AND PISTON DAMAGE REMNENTS OF VALVE FOUND IN MUFFLER.  STEM REMAINED FROZEN IN VALVE GUIDE.  RECOMMENDATIONS:  LYC SI 1425.  SL L197.

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