Incident
During the landing roll, the left main landing gear collapsed, and the aircraft subsequently slid to a stop.
Inspection Findings
Inspection of the left landing gear revealed that the upper and lower torque links, which maintain parallel alignment of the tire to the fuselage, had separated. The separation occurred as a result of the lower torque link being pulled over the outer washer, nut, and cotter key, which along with a bolt secure the upper torque link to the lower. Following the separation, the tire turned sideways, perpendicular to the direction of travel, after which the entire gear assembly collapsed rearward.
Maintenance Issue
Examination of the failed washer revealed that Cessna Service Information Letter ME83-37, which recommends replacement of the two outer washers with larger ones on the main landing gear scissor assembly (torque links), had not been complied with.