The flight data recorder retrieved from the crashed twin-engine, modern turboprop revealed that while flying in an area of thunderstorm-generated, airframe-shattering turbulence, its airspeed was 60 knots greater than the published turbulence penetration speed, or the speed for maximum gust intensity (VB). An inflight break-up occurred; structural pieces of the airframe were strewn over miles of countryside. Abnormally increased structural loads imposed on the airframe were suspected as a contributing factor in the accident.
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