The pilot reported that he was cleared to land on runway 30 right, but when he turned base, he observed a large airplane on final for 30 left. However, he continued the approach, and during the landing the flare was normal, but the airplane landed hard. He recalled that the airplane "seemed ok" and he taxied to parking and shutdown.

The following week, the airplane underwent an annual inspection. During the annual inspection the left wing false spar and trunnion required replacement.

The airplane sustained substantial damage to the left wing false spar and trunnion.

The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.