What happened
Shortly after touchdown, the aircraft began to swerve to the left. During this maneuver, the pilot reported hearing a scraping sound. The right main landing gear collapsed, causing the right wing to make contact with the runway. The aircraft eventually came to rest on the runway.
The investigation
An examination of the lower outboard portion of the right main landing gear leg was conducted. Investigators found that a fracture had occurred through the upper bolt hole attachment. Specifically, the forward portion of the bolt hole showed three fatigue regions that originated from corrosion pits. Additionally, the aft portion of the bolt hole exhibited one fatigue region originating from a corrosion pit. The aircraft had accumulated approximately 8,000 total hours of operation and had previously been used as a bush plane in Guatemala.