Accident Details
A flight instructor with 10,120 hours of experience was demonstrating autorotations in a helicopter. During the maneuver, the helicopter landed hard and bounced back into the air. As a result, the main rotor blades struck the tail boom. The helicopter began to rotate, at which point the throttle was reduced. The helicopter subsequently landed upright in a field. The instructor reported that after the accident, the wind was from 350 degrees at approximately 10 knots.
Weather Conditions
Weather reported near the time of the accident included wind from 040 degrees at 6 knots, visibility of 10 statute miles, clear sky conditions, temperature 84 degrees Fahrenheit, dew point 70 degrees Fahrenheit, and an altimeter setting of 29.94 inches of Mercury. The National Transportation Safety Board investigator-in-charge calculated the density altitude to be 2,485 feet mean sea level.