Williams was one of three operators of the parts retrieval system, a five-story robot built by the Unit Handling Systems division of Litton Industries. The robot was designed to retrieve castings from high density storage shelves at the Flat Rock plant. Part of the machine included one-ton transfer vehicles, which were carts on rubber wheels equipped with mechanical arms to move castings to and from the shelves. When the robot gave erroneous inventory readings, Williams was asked to climb into the racks to retrieve parts manually. Another news account states the robot was not retrieving parts quickly enough.
