Every AD in the library whose text names the Schempp-hirth DUO, of which 38 are registered in the US.
11 not superseded, 5 of them with a repeat action. 11 listed in all, newest published March 4, 2025.
Listed by the model designations in each AD's text. An AD written for a part number, or for "all" engines of a maker, may name no model and so not appear here: search the library for the part or the maker as well.
