# SDR 2012FA0000468

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2012
- Submitted: July 11, 2012
- Operation: General aviation
- Aircraft: N559ND
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S11001
- Aircraft time: 2,101 hours
- Engine: Lyc IO360L2A
- Engine time: 2,104 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Part number: LW19001
- Condition: Stuck
- Location: Exhaust
- Part time: 2,101 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: R, E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2012FA0000468

## Discrepancy

IN FLIGHT, ENGINE BECAME ROUGH, LOST POWER,  MADE AN UNSCHEDULED LANDING.  ON INSPECTION, FOUND STUCK EXHAUST VALVE ON NR 3 CYLINDER.  REPLACED CYLINDER WITH A SERVICABLE ASSEMBLY.  RAN AIRCRAFT, MAGS CHECKED GOOD.

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