Abstract: Employee #1, a maintenance technician, was in an aisle of a warehouse, servicing a stacker crane that was part of the automated storage and retrieval system (ASRS) at the facility. The ASRS consisted of conveyors, storage racks, and eight stacker crane storage/retrieval vehicles. The system was remote-controlled by computer, and it stored and retrieved loads from racks on both sides of each stacker crane. There was one such stacker crane for each aisle. Employee #1 was working on the vehicle when the ASRS operator activated it. Employee #1 was struck and killed. He had not locked out the vehicle's energy sources and the operator was not aware of his presence in the aisle.