A 54-year-old industrial maintenance worker (the victim) was killed when the aerial platform he was working from tipped and fell 19 feet to the floor of the construction-equipment manufacturing plant. The victim had been grinding the end of a shortened runway rail for a floor-operated overhead crane while another overhead crane was operating on an adjacent runway. As the operating crane traveled along its runway, it struck the aerial platform, knocking it off balance and causing it to tip over to the floor. When the platform and victim hit the floor, the victim sustained massive head trauma and internal injuries. Co-workers notified the emergency medical service who responded within 3 minutes, and the victim was transported to a local hospital where he was pronounced dead. NIOSH investigators concluded that, in order to prevent similar incidents, employers should: ensure that hazard assessment of work areas is conducted prior to work being performed; ensure that adequate zones of safety, marked by readily discernible warning devices, are established around maintenance areas in production facilities.