Abstract: Employee #1 was cleaning and chipping away dried cement from the back of a rotating, truck-mounted cement mixing drum, contrary to the employer's safety policy and to the employee's training. While standing on an elevated platform at the left rear of the mixing drum, Employee #1 bent over so that his head came between the charging hopper bracket and the end of the drum. At one point, Employee #1's head entered the end of the rotating drum, where the 5 in. high discharge fins were located. These fins were 180 degrees apart and spiraled inward, One of them struck Employee #1's head and he was killed instantly.