Every AD in the library whose text names the American Champion 7ECA, of which 791 are registered in the US.
4 not superseded, 1 of them with a repeat action. 4 listed in all, newest published October 29, 2009.
ADs written for equipment (an exhaust muffler, a display, a seat belt) whose text names the American Champion 7ECA, usually in a list of aircraft it is approved for. Whether one applies depends on whether that equipment is installed.
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.