# SDR 2024FA0000961

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2024
- Submitted: December 13, 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: Cylinder
- Part number: 658595
- Part serial: AC17CB527
- Condition: Cracked
- Location: Nr 5
- Part time: 837 hours
- 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/2024FA0000961

## Discrepancy

I PREVIOUSLY REPORTED THIS CYLINDER FOR A LOOSE VALVE GUIDE (CONTROL # 2024FA0000818). UPON FURTHER INSPECTION, THIS CYLINDER IS ALSO CRACKED IN THE TARGET AREA OF AD20-16-11.  CRACK CONFIRMED BY 10X MAGNIFIER AND FLORESCENT PENETRANT INSPECTION. THIS CYLINDER WAS SUBJECT TO AD 20-16-11 AND HAD BEEN PREVIOUSLY COMPLIED WITH BY RADIUS BLENDING MODIFICATION INSTRUCTIONS IN CONTINENTAL MANDATORY SERVICE BULLETIN #MSB18-08B,  BUT THE CYLINDER STILL CRACKED IN THE TARGET AREA OF AD 20-16-11.  THIS IS THE SECOND CROSSFLOW CYLINDER I'VE FOUND THAT WAS PREVIOUSLY COMPLIED WITH AD 20-16-11, BUT STILL CRACKED.  THE FIRST CYLINDER I FOUND AND REPORTED WAS CONTROL # 2024FA0000942. BOTH CYLINDERS WERE INSTALLED IN THE CYLINDER #5 POSITION, ON BOTH AIRCRAFT.

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