What happened
During the initiation of a winch tow, the left side of the glider's bridle attachment point became unattached from the fuselage. This created an asymmetrical force that pulled the aircraft to the left, causing the left wing to strike a parked truck.
While still under tow via only the right side and continuing to accelerate, the glider veered at a sharp angle away from the runway toward a windsock pole. The aircraft launched into the air and the inboard portion of the right wing struck the top of the windsock pole. Following this impact, the pilot activated the release mechanism to disconnect the tow wire.
The aircraft's right wingtip then made contact with the ground. The glider subsequently swung approximately 270 degrees, causing the fuselage and tail to strike the ground before coming to a complete stop. There were no injuries reported.
Findings
An investigation by an FAA inspector determined that the incorrect attachment of the bridle by the ground crew was the primary factor in the accident.