On Thursday, October 20, 2016 at 5:43:58 AM UTC-7, wrote:
Yes I know, but having this info might be an indication of since when this practice has been started by ELAN

S

Yes it would, but ELAN never kept track of when they started doing it. The only way to find out now would be to cut into every DG300 wing and see. Aside from the glider in which the defect was initially discovered I haven't heard of any other DG300 owner opening up their wings so we don't have a significant amount of data as to which gliders have been proven to have the problem.