Initial findings of the investigation into the fatal crash last month of an experimental aircraft at Jackson Hole Airport suggest the crash was due to engine failure. According to the preliminary report by the National Transportation Safety Board, numerous witnesses stated that they heard the plane’s engine producing abnormal sounds that were described as (in the words of the report) “multiple high revving sequences and a sputtering/popping noise akin to the engine misfiring.” The report goes on that the witnesses said the engine appeared to either lose partial or total power. The NTSB also says the Jackson Hole Air Traffic Control Facility recorded radio communications between the pilot and controller. Among the final transmissions from the plane were the words, “Jackson tower, eight-two-aero-romeo-victor – I just lost my………… lost power here.” The report says investigators have retained some of the aircraft’s parts and several cockpit instruments for further investigation. Russell and Carol Kamtz of Loveland, Colorado, had flown from Montana to the Jackson Hole Airport where they refueled, spending just 15 minutes on the ground. The crash occurred shortly after take-off as Kamtz was circling to return to the airport due to unspecified problems. Both the pilot and passenger died in the crash.