Incident Description
The pilot reported a normal landing, but during the landing roll a loud 'bang' was heard and the right main landing gear collapsed.
Investigation Findings
An investigation was conducted by an FAA airworthiness inspector. It was noted that a washer in the right main landing gear assembly had failed. The failed washer was part of the scissor assembly.
Maintenance Records Review
A review of the aircraft maintenance records revealed that Cessna Aircraft Service Information Letter Number ME83-37, dated November 23, 1983, had not been complied with. This service letter recommended the replacement of the original washers with a new washer, Cessna part number S1450-5H12-063 (old part number 5045018-2).
Probable Cause
The official probable cause, as stated in the investigation, was: "Right main gear scissors assembly becoming disconnected during landing roll, allowing the right run landing gear to collapse; scissor assembly washers not being replaced as recommended in cessna aircraft service bulletin ME83-37."