September 12th, 1975: Gordon McCollom, 25, of Costa Mesa, California – Occurring fifteen minutes after the crash of Washburn's AT-6, McCollom, a professional gymnast and wing-walker, was hanging under a modified "Super" Stearman PT-17, registered as N121R and piloted by Joe Hughes, to cut a ribbon near the ground. Suddenly, the Super Stearman dropped too close to the runway in what one official called a “freakish downdraft,” and the plane's tail hit the ground, and causing McCollom to scrape the top of his head on the concrete runway during the finale of his performance, killing him instantly. The Stearman's rudder ripped off before Hughes could climb again, roll upright, and land the airplane. The NTSB found the probable cause of this accident to the pilot-in-command's misjudgment of clearance from the ground, but unfavorable wind conditions contributed to mishap.