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Animation of Crash of Alaska Dept. of Public Safety Helicopter During a Search and Rescue Mission.

This three-dimensional (3-D) animated reconstruction shows the March 30, 2013 accident involving a Eurocopter AS350 B3, N911AA, registered and operated by the State of Alaska, Department of Public Safety (DPS), which impacted terrain while maneuvering near Talkeetna, Alaska. The animation depicts the final 3 minutes of the 7-minute accident flight. The animation begins at 23:16:36 Alaska daylight time and ends at 23:20:01, just before the helicopter impacts the ground. The end of the animation transitions to an overhead photograph of the crashed helicopter at the accident site. The animation depicts a reconstruction of the sequence of events based on information extracted from the Appareo Vision 1000 Video/Data Recorder unit installed on the helicopter. Local time, altitude (above ground level) and airspeed are shown as text across the top of the animation. The left side of the animation shows a view from inside the cockpit, and the right side of the screen shows an external view of the helicopter. The animation does not depict the weather or visibility conditions at the time of the accident. The animation includes audio narration. The instruments depicted in the cockpit view of the animation are generic and do not represent the instruments in the accident helicopter. The attitude of the helicopter is based on data from the Appareo unit, which was not properly calibrated when installed, so the recorded data exhibits pitch and roll offsets. The animation data has been adjusted to remove these offsets. In addition, the GPS position and altitude data has been smoothed for the animation. The attitude of the helicopter depicted in the animation becomes unreliable after time 23:18:00, which will be noted during the animation, because the helicopter starts to experience large yaw, pitch, and roll rates. Nonetheless, the motions shown after this time are likely representative of the extreme angular rates and attitudes actually achieved.