What happened
The aircraft touched down on runway 31. Immediately following touchdown, the right main landing gear collapsed, which caused the airplane to veer off the right side of the runway.
The investigation
Investigators discovered that the aircraft had recently undergone a modification intended to increase its gross operating weight from 14,500 to 16,000 pounds. During the examination of the landing gear components, it was found that both actuator positioning cams had been ground down at the down lock lobes. The removal of material from these cams is not an authorized procedure for this aircraft.
Additionally, the investigation revealed that the outer races of both right main landing gear down lock roller bearings had failed. During the recovery efforts, the FAA located one bearing in pieces on the runway, while the second bearing was not recovered.