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United Airlines Flight 409
United Airlines Flight 409 was a scheduled flight departing from Denver, Colorado to Salt Lake City, Utah. On October 6, 1955, the aircraft operating the service, a Douglas DC-4 propliner, registration crashed into Medicine Bow Peak, near Centennial, Wyoming, killing all 66 people on board (63 passengers, 3 crew members). The victims included five female members of the Mormon Tabernacle Choir and military personnel. At the time, this was the deadliest airline crash in the history of American commercial aviation.〔 Another 66 lives had been lost earlier that year in the March 22 crash in Hawaii of a United States Navy Douglas R6D-1 Liftmaster military transport aircraft,〔(Aviation Safety Network Aircraft Accident Douglas R6D-1 (DC-6) 131612 Honolulu, HI )〕 and 66 had also died in the mid-air collision of two United States Air Force C-119G Flying Boxcars over West Germany on August 11, placing the three crashes in a three-way tie as the deadliest aviation incidents in 1955.〔(Aviation Safety Network: Accident Description )〕〔(Aviation Safety Network: Accident Description )〕
== Timeline ==
Flight 409 left Denver, Colorado at 6:33 a.m. on October 6, 1955. This was 83 minutes after its scheduled departure time. The assigned path the airliner was expected to fly was along airways V-4 Denver to Laramie, Wyoming V-118 to Rock River, Wyoming radio, V-6 to Fort Bridger, Wyoming, and V-32 to a landing in Salt Lake City. The flight was operating under Visual Flight Rules and was assigned a cruising altitude of 10,000 feet. Because the aircraft was not pressurized, the altitude was chosen to keep the passengers and crew from experiencing the discomfort that flying higher could cause. The route assigned to the airliner was specifically designed to allow safe passage at 10,000 feet over the continental divide in the Rocky Mountains.〔 (a (text version ) is also available)
(if links above fail to load report, visit (http://dotlibrary.specialcollection.net ) and select "Historical Aircraft Accident Reports (1934-1965)", then retry report links)〕
An expected position report from the United crew, scheduled for 8:11 a.m. while over Rock Springs, was not received, and repeated attempts to make radio contact with flight 409 were met with no response. With the airliner's status unknown, the Civil Aeronautics Authority was alerted to the missing aircraft. No radar was in place for civil aviation in this region in 1955. With no radar traces, manual searches were required to find the aircraft.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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