The pilot carried out a normal full flap approach into a steady 15 knot headwind. Immediately before touch down the aircraft was struck by a strong wind gust from the left. The aircraft yawed sharply to the left and the nose lifted. The pilot applied full power and attempted to lower the nose but the aircraft touched down heavily on its main wheels and tail tie down ring. The aircraft did not bounce and the pilot elected to complete the landing. It was likely that the aircraft had been affected by a willy-willy at a critical stage of the approach. The pilot's recovery actions were unable to prevent the resulting heavy landing.
