Approach and Landing
As the pilot approached the airport, he monitored the ASOS weather broadcast and learned that the winds were from 120 degrees at 12 knots. The airport had a single asphalt runway oriented 03-21. These conditions presented a direct 90-degree crosswind relative to the runway.
The pilot initially made a touch-and-go landing on runway 03, then turned around and landed on runway 21.
Loss of Control
During the landing roll on runway 21, the airplane swerved to the left. According to the pilot, this was due to a "possible gust of wind or [the] pilot was too slow in rudder correction." In response, the pilot applied "hard right rudder." The airplane then responded with a "rapid turn to the right" that the pilot was unable to counter.
Damage
As a result of the uncontrolled turn, the left wing struck the runway surface, causing main spar damage.
Investigation
The investigation did not determine a precise cause for the loss of control, but noted the pilot's description of events.