9 May 1932: At McCook Field, Ohio, Captain Alfred F. Hegenberger, U.S. Army Air Corps, flew the very first solo instrument approach and landing, using a system which he had developed. The Hegenberger system, which was adopted by both civil and military aviation authorities, used a series of non-directional beacons (NDB) and marker beacons on the ground, along with a […] The post 9 May 19…