Fort Collins

The pilot-owner/operator, who was seated in the right seat, said the left seat pilot made the approach to runway 15. The wind was reported as being from the southwest at 20 knots with no reference to gusts. He said the pilot aligned the airplane 40 feet left of runway centerline and failed to flare. The airplane contacted the runway, bounced back into the air with the right wing high, and began drifting to the left. The right seat pilot took control, first trying to lower the wing then attempting to abort the landing. The airplane struck the ground and cartwheeled. The left seat pilot said he was 'receiving training' from the pilot-owner and was 'not at the controls' at the time of the accident.

The pilot was operating his aircraft under the rules of 14 cfr 135, i.e., a scheduled domestic cargo flight. He made a normal departure and climb en route to Salt Lake City, UT. Normal communications and radar flight following was established with Denver ARTCC. Approximately 8 miles west of fort collins, the aircraft suddenly disappeared off of radar and voice contact with the pilot was lost.

A maintenance supervisor and two pilots noted that the left engine did not respond normally while being started. Aft starting, the pilot taxied to runway 10 for an IFR departure. Since the taxiway did not extend to the end of the runway, the pilot of another aircraft waited on the taxiway, just short of the runway, approximately 2,967 feet from the end. He observed smoke coming from the left engine of the MU-2 and reported this info on the unicom frequency. He reported that the MU-2 continued and rotated for takeoff approximately 200 to 250 yards east of his position. Reportedly, the aircraft climbed to approximately 300-400 feet afl, then turned left toward higher terrain. After turning, it enter what two witnesses described as a VMC roll, then crashed and burned. An examination of the airframe revealed no preimpact mechanical failures. A teardown of the left engine revealed that a turbine bearing, pn 3101092-1, had been misaligned and subsequently began to fail, damaging the 2nd and 3rd stages of the turbine section. The airport elev was 6,597 feet. The computed takeoff roll was 1,620 feet and the computed accelerate stop distance was 3,100 feet. The landing gear and selector found in down position. The aircraft was destroyed and all six occupants were killed.

After takeoff from Lamar Municipal Airport, while climbing, the twin engine airplane entered a controlled descent then crashed in a field located three miles south of the airport. The aircraft was destroyed and all four occupants were killed.

The crew was completing a cargo flight from Denver-Stapleton to Ogden-Hill AFB, Utah. En route, while cruising at an altitude of 8,700 feet in poor weather conditions, the airplane struck the slope of a mountain located near Fort Collins. The wreckage was found few hours later and both pilots were killed. At the time of the accident, weather was poor with icing conditions and turbulences. It is believed the airplane lost altitude until it impacted terrain.

Flight 610 of June 29, 1951, originated in San Francisco, California, and was scheduled to Chicago, Illinois, with en route stops, among which were Oakland, California, Salt Lake City, Utah, and Denver, Colorado. The crew consisted of Captain J R Appleby, First Officer H G Tower, Flight Engineer A T Petrovitch, and Stewardesses C J Baymond and F M Smith. The flight departed San Francisco on schedule at 1915 and after stopping at Oakland proceeded to Salt Lake City, arriving there at 2324. It departed Salt Lake City at 0011, June 30, 1951, 26 minutes behind schedule due to the reloading of bulky cargo At the time of departure the aircraft weighed 78,597 pounds, which was within the certificated gross take-off weight of 79,380 pounds, the load was properly distributed with respect to the center of gravity. There were five crew members, forty-four adult passengers and one infant on board. The approved flight clearance indicated an IFR flight, via Bed Airway 49, Green Airway 3, and Amber Airway 3, to Denver at a cruising altitude of 15,000 feet, with Omaha, Nebraska, designated as the alternate airport. The flight proceeded in a routine manner and at 0104 reported over Rock Springs, Wyoming, at 15,000 feet, estimating its arrival over Cheyeme, Wyoming, at 0147 and over Denver at 0207 2 Forty-three minutes later, at 0147, the flight reported having passed the Silver Crown fan marker (located 12 miles west of Cheyenne) and requested a lower altitude Accordingly, a new clearance was immediately issued-"ARTC clears United 610 to Dupont intersection, 3 descend to 8500 feet immediately after passing Cheyenne, maintain 8500 feet, no delay expected, contact approach control over Dacono "4 This clearance was acknowledged and the flight reported that it was over Cheyenne at 0147, at 15,000 feet and was now starting to descend. The Denver altimeter setting was then given the flight as being 30 19 inches. Nine minutes later, at 0156, the flight reported reaching its assigned altitude of 8,500 feet No further communication was received from the flight. At 0200, the Denver Control Tower requested the company radio operator to advise the flight to call approach control Repeated calls were made without an answer. It was later determined that Flight 610 had crashed on a mountain (Mt Crystal) 18 miles west-southwest of Fort Collins, Colorado. All 50 occupants were killed.