Incident Overview
A flight instructor was providing flight instruction and recurrent training to a private pilot in a tailwheel-equipped airplane. During the landing on a dry, paved runway, the private pilot allowed the airplane to veer to the left of the runway centerline. The instructor then took control in an attempt to realign the airplane, but the airplane ground looped to the left and continued off the left side of the runway.
Post-Impact Sequence
After departing the runway surface, the airplane's main wheels struck a snowbank, causing the airplane to nose over. The impact and subsequent nosing over resulted in structural damage to the wings, wing lift struts, fuselage, and empennage.
Mechanical Condition
Both pilots reported that there were no preaccident mechanical anomalies with the airplane. The aircraft was operating normally prior to the event.