Abstract: Employee #1 was operating a Grove mobile hydraulic crane, model TM275, serial #4896, and attempted to unload a 10-ton piece of concrete from a 40 ft flat bed trailer. The load capacity exceeded the 11,000 lb maximum rated capacity for the angle and length of the boom. The radius was 40 ft and the boom length was approximately 50 to 55 ft. A maximum of 11,000 lb is allowed in that pick-up radius regardless of boom length. The concrete was lifted high enough to allow the truck and trailer to move. When Employee #1 started to move the load, the crane tipped over. Employee #1 was thrown through the top of the open cab and landed on the boom, sustaining a sprained ankle and minor scrapes. Employee #1 had been employed for one year.