On 21 May 2012, the Civil Aviation Safety Authority announced amendments to Civil Aviation Orders CAOs 40.1.0, 40.3.0 and 82.0 to mandate the use of simulators for endorsement and proficiency check training in certain types of aircraft. This is in response to recent aircraft accidents including a fatal incident which occurred when an aircraft crashed shortly after takeoff on a training flight. In total, the amendments include three measures for endorsement training and two measures for proficiency training. Simulator use has not been mandated for proficiency checks for aircraft with a Maximum Takeoff Weight above 8,618kg. The Regulation Impact Statement was prepared by the Civil Aviation Safety Authority and has been assessed as adequate by the Office of Best Practice Regulation.