Incident Description
According to a witness, the airplane flared smoothly and touched down with what appeared to be no side load. As the aircraft settled onto the runway surface, the right main gear collapsed, and the aircraft subsequently skidded off the right side of the runway.
Examination Findings
During examination of the right main landing gear, it was discovered that the gear pivot assembly was fractured adjacent to the spline. It has not been determined whether the fracture occurred during gear retraction, extension, or upon contact with the runway. Visual inspection of the fractured surface showed evidence of overload, however a small area on the outer portion of the surface had several small cracks bordering the edge. The failed pivot assembly, part number 2441100-9, had a total time of 1,611.8 hours.
Maintenance History
According to maintenance records, Cessna Service Bulletin SE390.1, dated April 20, 1990, was applicable to this aircraft and was complied with. The purpose of the Service Bulletin was to inspect main landing gear pivot assemblies for cracks in the spline area.