# SDR 2016FA0000442

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2015
- Submitted: September 19, 2016
- Operation: General aviation
- Aircraft: [N709LU](https://openairdocs.org/aircraft/N709LU), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S11419
- Aircraft time: 630 hours
- Engine: Lyc IO360L2A
- Engine time: 630 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Condition: Leaking
- Location: Nr 4 Cylinder
- Part time: 630 hours
- Stage of operation: CL
- 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/2016FA0000442

## Discrepancy

AFTER TAKE OFF,  FLIGHT CREW REPORTED LOSS OF 200 RPM AND AN ENGINE VIBRATION, FLIGHT CREW RETURNED AND LANDED IMMEDIATELY.  PERFORMED DIFFERENTIAL CYLINDER LEAK CHECK AND DISCOVERED CYLINDER NR 4 HAD A STUCK AND LEAKING EXHAUST VALVE.  ENGINE TOTAL TIME 629.6.

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