It touches every aspect of our lives, our economy and our future. For example, general aviation contributes more than 150 billion to the United States economy annually and employs more than 1 265 000 people [1]. As to the engine type, single-engine piston-powered airplanes comprise most of the current general aviation aircraft. In the United States over 80 of the general aviation fleet are equipped with single piston engine and most of them are personal-use aircraft, thanks to their relatively low