One of the permanent subjects in aviation safety is human factors in aviation. As the development of flight equipments and systems has become more controlled, measureable and reliable, more and more professionals, researchers and experts in the field of air transportation are focusing their attentions on the operator of those equipment and system, human being. A number of studies are conducted to learn how human operates those machines and what social and psychological factors come into play while operating the aviation equipments and systems. Human factors in aviation is a comprehensive study of human’s limitations, capabilities, behavior and how these factors and knowledge are integrated into the system that is designed for air transportation with the goals of enhancing performance, safety and the general well-being of the operator of systems. Human factors do not just contribute “in the air”, but “on the ground” people with a job description of air craft maintenance also contributes in the overall safety