Incident Overview
A helicopter pilot was performing external load operations when a gust of wind caused the lifting strap to contact the tail rotor. The helicopter subsequently began to shudder and rotate to the left. The pilot initiated an autorotation, but during the landing sequence, the helicopter rolled over onto its left side.
Environmental Conditions
At the time of the accident, an airport located approximately 4 miles east-southeast of the accident site reported winds from 200 degrees at 17 knots, with gusts up to 23 knots.
Sequence of Events
The external load operation was underway when a sudden wind gust blew the lifting strap into the tail rotor. This contact induced vibrations and an uncommanded left rotation. The pilot responded by entering an autorotation, a maneuver used to land without engine power. However, upon touchdown, the helicopter tipped onto its left side, resulting in the rollover.