# SDR N3XR202012090001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 3, 2020
- Submitted: December 9, 2020
- Operation: General aviation
- Filed by: [Embry-Riddle Aeronautical University Inc, repair station N3XR816N](https://openairdocs.org/faa-repair-station/N3XR816N/embry-riddle-aeronautical-university-inc.md) (OpenAirDocs)
- Aircraft: [N417ER](https://openairdocs.org/aircraft/N417ER), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S11445
- Aircraft time: 5,948 hours
- Engine: Lyc IO360L2A
- Engine time: 4,271 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Condition: Stuck
- Location: Nr 4 Cylinder
- Part time: 2,269 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/N3XR202012090001

## Discrepancy

DURING FLIGHT, THE CREW EXPERIENCED A SIGNIFICANT VIBRATION.  THEY LANDED AT THE NEAREST AIRPORT.  EXAMINATION REVEALED THAT THE NR 4 CYLINDER HAD A STUCK VALVE, RESULTING IN A BENT PUSHROD.  THE CYLINDER AND PUSHRODS WERE REPLACED WITH A REPAIRED/NEW UNITS.

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