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United Airlines Flight 610
On June 30, 1951, United Airlines Flight 610, a US transcontinental San Francisco–Oakland–Salt Lake City–Denver–Chicago service flown by the Douglas DC-6 aircraft ''Mainliner Overland Trail'' (registration N37543) crashed in Larimer County, northwest of Denver. All 50 on board (45 passengers and 5 crew) were killed.
== Events leading up to crash ==
After completing its first two segments, Flight 610 departed Salt Lake City at 12:11 a.m. en route to its next destination of Denver. At around 1:47 a.m. Flight 610 reported to traffic control that it had passed the Cheyenne radio range station and requested lower altitude, which was granted to 8,500 feet.
At that point, Flight 610 was scheduled to make a right turn to intercept the 168 degree course line of the DEN low frequency range, and then to proceed to the WONT intersection, which was its next clearance limit. To intercept that course line, the plane turned to a heading of approximately 210 degrees, which was a proper intercept angle of almost 45 degrees. If the pilot had configured his audio selector switches properly, he would have been able to hear the aural Morse code identifier of "A", for the north side of that low frequency range, and then as he neared the course line itself, he would begin to hear the "N" identifier. That would be the signal that it was time to turn left again, and track the 168 degree course line to the WONT intersection. But, the plane never turned left again. Instead, it remained on that fatal 210 degree intercept heading, until impact.
As the plane descended to its cleared altitude, it continued its fatal heading towards high terrain. At 2:00 a.m. the DC-6 crashed into Crystal Mountain, about 50 miles NNW of Denver, skidding 690 feet to a stop, as it burst into flames.
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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