What happened
The pilot, holding commercial certification, was attempting to land an aircraft under challenging weather conditions. Winds were estimated at 30 knots with gusts reaching 40 knots. Shortly before touchdown, the aircraft encountered a downdraft, which resulted in a harder-than-normal landing impact.
During the later stages of the landing rollout, the pilot applied the brakes. At this point, the left main gear leg collapsed, causing significant damage to the aircraft's landing gear structure.