What happened
A certified flight instructor (CFI) and a student pilot, who had 26 hours of flight time, departed for a local training flight in their aircraft. During the landing phase on runway 32, the aircraft touched down approximately 1,000 feet from the approach end of the runway.
As the aircraft was on the ground, a sudden gust of wind originated from the right side. The instructor attempted to counteract the wind by applying heavy left rudder and braking, but these inputs were ineffective. During the struggle to maintain directional control, the left wing tip struck the pavement.
The momentum of the aircraft carried it off the runway onto the adjacent turf. While the left brake remained locked, causing the loop to halt, the nose of the aircraft slowly tipped downward. The occupants were not injured during the event.
Findings
The instructor noted that the entire incident occurred at a very low speed. This low airspeed appeared to be insufficient for the flight controls to provide any effective countering force against the sudden wind gust.