Accident Overview
During the approach, the pilot verified that the landing gear was down and locked several times. After a normal landing, the landing gear suddenly collapsed during rollout. The incident occurred without any prior indication of mechanical issues.
Examination Findings
An examination of the airplane revealed that the attachment rivets of the landing gear transmission had failed due to undetermined reasons. The transmission had completely separated from the attach bracket. Further inspection showed that some of the rivets were sheared out prior to the accident flight. The exact cause of the rivet failure remains undetermined.
Conclusion
Based on the evidence, the landing gear collapse was directly linked to the failure of the transmission attachment rivets, leading to a loss of structural integrity during rollout.