DOT/FAA/RD-95/6 DOT-VNTSC-FAA-95-4 Federal Aviation Administration, Final Report, April 1995 Airframe manufacturers, aircraft associations, airlines, pilot groups, air traffic controllers, government and regulatory agencies, and other organizations and individuals have developed this training resource dedicated to reducing the number of wake-turbulence accidents and incidents. The training package consists primarily of this document. Additionally, a companion video developed by the Wake Turbulence Training Aid Industry Team is also available. Wake-turbulence accidents and incidents have been, and continue to be, a significant contributor to the worldwide safety statistics. The National Transportation Safety Board (NTSB), in a report on safety issues related to wake-vortex encounters, stated that data shows that between 1983 and 1993, there were at least 51 accidents and incidents in the United States that resulted from probable encounters with wake vortices. As a result of these encounters, 27 occupants were killed, eight were seriously injured, and 40 aircraft were substantially damaged or destroyed. In this report, the NTSB raised concern over "the adequacy of air traffic control procedures" and "pilot knowledge related to the avoidance of wake vortices."