Abstract: On May 24, 1994 Employee #1, an electrician for Ad Art Electronic Sign Corporation, was assigned to install light bulbs in a sign. Employee #1 was using a truck mounted extensible boom lift to aid in accomplishing the installation. The boom was attached to a single line crane. As the employee extended the boom, there was less give on the crane load line. The crane load block contacted the boom tip, "two-blocking" the crane. The employee continued to try to extend the boom. The crane load line snapped in two, causing the boom to lurch forward. The lift basket struck the sign ejecting the employee. The employee fell approximately 37 feet and was fatally impaled on a scaffold vertical member.