# SDR 2024FA0000818

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 6, 2024
- Submitted: November 6, 2024
- Operation: General aviation
- Aircraft: [N681S](https://openairdocs.org/aircraft/N681S), registered now
- Make and model: Cirrus SR22
- Registry model: [Cirrus SR22](https://openairdocs.org/model/cirrus-design-sr22) (OpenAirDocs)
- Aircraft serial: 4398
- Aircraft time: 1,269 hours
- Engine: Cont IO550N
- Engine time: 1,269 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve Guide
- Part number: 636242P005
- Condition: Loose
- Location: Cylinder
- Part time: 837 hours
- Component: Cylinder
- Component part number: 658595
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2024FA0000818

## Discrepancy

PILOT REPORTED AN UNUSUAL VIBRATION DEVELOPING IN FLIGHT BETWEEN 2200-2400 RPM.  I FOUND THE #5 CYLINDER EXHAUST VALVE GUIDE, PN: 636242P005, WAS LOOSE, FLOATING IN THE CYLINDER.  LOGBOOKS INDICATE THE #5 CYLINDER WAS AN OVERHAULED CYLINDER. THE CYLINDER WAS OVERHAULED BY CMS CONTINENTAL MOTORS SERVICES, 8600 COUNTY ROAD 32, FAIRHOPE, ALABAMA, 36532. WORK ORDER # CS-9224, DATED NOVEMBER 15TH 2019. CYLINDER PN: 658595 SN: AC17CB527.  THE OVERHAULED CYLINDER WAS INSTALLED 11/27/2019 AND HAS 836.9 HOURS OF OPERATION SINCE OVERHAUL.

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