Incident Overview
According to the pilot, during a landing on firm sand, the right landing gear leg separated at the wheel attachment upper bolts. The remaining gear leg dug into the sand, causing the airplane to spin around.
Damage Assessment
The airplane sustained substantial damage to both main landing gear attachments and both wings.
Material Examination
The NTSB materials laboratory examined the separated components and found areas of fatigue at both upper bolt holes. Additionally, corrosion pitting was observed at one of the fatigue sites.
Operational History
The airplane had been operated on skis in the past.
Conclusion
The facts provided do not include a stated probable cause for the incident.