This notice of Final Ruling on the Modified wing AD recommends inspection of those aircraft with the winglets in suit with the procedures outlined for wing extension modified aircraft.
During my next annual I will be looking very seriously at the identified locations per the AD. I will be at the second year anniversary with the winglets installed and I have had one flight with severe turbulence. I looked at the wings very close last year when the SAIB came out and did not find any concerns. When I installed the winglets I planned on following the suggested installation instructions but from the suggestion of the paint shop I used rivnuts were installed on all fasteners instead of using sheet metal screws. I will keep the message board updated with the inspection results.
http://www.regulations.gov/contentSt...ontentType=pdf