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Accident investigation report completed and information captured
Narrative: The flight instructor was taking three local community college students on an orientation flight. The passenger in the front left seat was on the controls with the instructor during the takeoff. Witnesses observed the airplane pitch up aggressively during the takeoff, approaching a near vertical attitude before stalling and impacting the ground adjacent to the runway. The engine continued to run normally during the event. A rear seat passenger reported that the flight instructor told the passenger to let go of the controls, but that the passenger continued pulling back. The front seat passenger stated that after the airplane 'tilted too far back' during the takeoff, he kept his hands on the yoke for several seconds before he eventually let go. Due to the extent of his injuries, the flight instructor did not recall the event. All four occupants sustained serious injuries and the airplane was substantially damaged. An examination of the wreckage did not reveal evidence of a mechanical malfunction or anomaly.
Given this information, it is likely that the front seat passenger who was manipulating the controls with the pilot applied excessive back pressure on the yoke, resulting in an over rotation, aggressive initial climb, and subsequent aerodynamic stall. The flight instructor's remedial actions were not sufficient to prevent the stall, and the airplane subsequently impacted the ground.
Probable Cause: The passenger's excessive control application during the takeoff and the flight instructor's inadequate remedial action, which resulted in an aerodynamic stall and impact with terrain.