The cause of the outage was not immediately known. On June 16, 1965, the Federal Aviation Administration cautioned that aviators who flew through the arch would be fined and their licenses revoked. At least ten pilots have disobeyed this order, beginning on June 22, 1966. In 1973, Nikki Caplan was granted an FAA exception to fly a hot air balloon between the arch's legs as part of the Great Forest Park Balloon Race. During the flight, on which the St. Louis park director was a passenger, the balloon hit the arch and plummeted 70 feet before recovering. In 1976, a U.S. Army exhibition skydiving team was permitted to fly through the arch as part of Fourth of July festivities, and since then, numerous skydiving exhibition teams have legally jumped onto the Arch grounds, after having flown their parachutes through the legs of the Arch. The arch has been a target of various stunt performers, and while such feats are generally forbidden, several people have parachuted to or from the arch regardless. In June 1980, the National Park Service declined a request by television producers to have a performer jump from the arch; a similar appeal by stuntman Dan Koko was also turned away in February 1986. Koko, who was a stunt double for "Superman", wanted to perform the leap during Fourth of July celebrations. In 2013 Alexander Polli, a European BASE jumper, planned to fly a wingsuit under the arch but had his demo postponed by the FAA.  1980 accident  On November 22, 1980, at about 8:45 a.m. CST, 33-year-old Kenneth Swyers of Overland, Missouri, parachuted onto the top of the arch. His plan was to release his main parachute and then jump off the arch using his reserve parachute to perform a base jump. Unfortunately, after landing the wind blew him to the side, and he slid down the north leg to his death. The accident was witnessed by several people, including Swyers' wife, also a parachutist. She said her husband "was not a hot dog, daredevil skydiver" and that he had prepared for the jump two weeks in advance. Swyers, who had made over 1,600 jumps before the incident, was reported by one witness to have "landed very well" on the top of the arch, but "had no footing." Swyers was reportedly blown to the top of the arch by the wind and was unable to save himself when his reserve parachute failed to deploy. The Federal Aviation Administration said the jump was unauthorized, and investigated the pilot involved in the incident.