On October 25, 2004, approximately 1830 central daylight time, an employee, who was operating a Lektro electric pushback vehicle, was seriously injured when he was struck by a turning propeller blade from a Saab SF-340B twin-engine airplane, N376AE, operated by American Eagle Airlines, Inc., of Fort Worth, Texas. The 4 crewmembers and 29 passengers aboard the airplane were not injured, and the airplane and pushback vehicle were not damaged. The scheduled passenger flight was operating as Eagle Flight 3259 under 14 Code of Federal Regulations Part 121, and was preparing to depart the Dallas-Fort Worth International Airport (DFW), with the Robert Gray Army Airfield (GRK) near Killeen, Texas, as its intended destination. According to a written report submitted by the airline's safety department, two employees began to perform a pushback procedure to the airplane in preparation for departure. A ground employee was operating a Lektro electric pushback vehicle, and a second ground employee was acting as a wing-walker on the left side of the airplane. As the pushback procedure began, the vehicle began to move to a jack-knife position toward the right wing. The number two engine was running, and the propeller was turning in the "feathered" position. At this time, the Captain and First Officer signaled to ground personnel to halt the pushback. According to witnesses, the employee operating the pushback vehicle appeared to be in "a state of shock." The vehicle continued to turn about the nose of the airplane until the second employee, who was acting as a wing-walker, ran to the vehicle and stopped the pushback movement. The original operator exited the vehicle on its left side toward the right wing. The pushback vehicle was now positioned nearly 90-degrees to the longitudinal axis of the airplane and about 10 to 11 feet from the turning propeller. According to witnesses, the original operator of the vehicle still appeared to be in "a state of shock," as he began walking backwards toward the spinning propeller. Following a few steps back, the employee was struck by the propeller "at least twice," before falling to the ground. The flight crew immediately shut down the engine and called for emergency personnel. According to the Push-out/Towing Procedures of the American Eagle Station Operating Manual, one wing-walker and one vehicle operator are required for a pushback procedure. The manual states, "normal procedures call for the push-out vehicle operator to communicate with the Captain through use of company supplied ground-to-cockpit headsets. In rare instances when the headsets are inoperative or the ramp has been advised of lightning in the area, hand signals will be used for communication between ground personnel and the Captain. In these cases, when hand signals are to be used, an additional ground agent will be required. The agent will communicate hand signals to the cockpit, as the push-out vehicle operator cannot safely operate the push-out vehicle and maintain constant visual contact with the Captain during the push-out process." The operator of the push-out vehicle and the wing-walker were not wearing ground-to-cockpit headsets at the time of the accident, because the headsets were not working properly. The injured employee was hired by the airline as a "Fleet Service Clerk" on April 5, 2004. The employee completed training for ground procedures for the Saab 340 airplane on May 2, 2004, and he completed training on the Lektro electric pushback unit on October 23, 2004. Ground personnel reported that this was the first time that the injured employee had operated the pushback vehicle alone.