NTSB Identification: DEN05FA074.
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Accident occurred Wednesday, May 11, 2005 in Ouray, CO
Probable Cause Approval Date: 08/29/2006
Aircraft: Cessna T210G, registration: N6807R
Injuries: 4 Fatal.
NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.
The airplane was reported missing and the Civil Air Patrol located the wreckage near Mt. Whitehouse. A debris path, approximately 1/2 mile wide and 1 1/2 miles long was located in mountainous terrain, varying in elevation from 10,000 feet to 12,800 feet mean seal level. National Track Analysis Program radar data depicted the accident flight from 1252:27 until 1856:17, and the altitude varied from 17,500 feet msl to 19,200 feet msl. The aircraft ground speed during this time was measured to be between 124 knots and 314 knots. No flight plan had been filed and no weather briefing had been obtained. An Airman's Meteorological Information (AIRMET) for occasional moderate turbulence below FL180 (Flight Level 18,000 feet) was valid. The last radar return from the accident airplane was located within this advisory area. In addition, an AIRMET for occasional moderate turbulence between FL180 and FL410 and possible mountain wave action had been issued. The last radar return from the accident airplane was located within this advisory area. The right wing was located 4,461 feet (0.8 miles) west of the main wreckage at an elevation of 11,175 feet msl. The left wing was located 2,772 feet (0.5 miles) west of the main wreckage at an elevation of 11,500 feet msl.. The debris path started with the right wing and continued in an easterly direction towards the main wreckage. The propeller was located directly above the main wreckage at an estimated altitude of 12,800 feet msl. The fuselage, engine, propeller, horizontal stabilizer, and elevator were not recovered. These could not be examined for anomalies. The airplane's systems, including the vacuum, pitot static, electrical, and powerplant, could not be examined for anomalies. No evidence of fatigue cracking or other type of preexisting fracture was noted within the recovered wings. No record of a preflight or in-flight weather briefing, obtained by the pilot, was located.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: the pilot's inadvertent flight into adverse weather conditions, loss of control, and resulting exceedence of the design stress limits of the aircraft. which led to an in-flight structural failure. Factors in the accident included the pilot's inadequate preflight and in-flight planning and decision making, the severe turbulence, and the mountain wave. Full narrative available
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