WASHINGTON, Jan. 9 -- The U.S. Department of Transportation's Federal Aviation Administration issued the following fact sheet: * * * Engineered Material Arresting System (EMAS) Background The runway safety area (RSA) enhances the safety of aircraft that undershoot, overrun, or veer off the runway. The RSA provides a clear, graded area which provides additional space for pilots to bring their aircraft to a safe stop. Though RSAs vary in size by runway, they can be as large as 500 feet wide an  more