Human factor being the main caused of flight accident and because one of the necessary investigation procedure is the post-mortem study of the death bodies which give understandings of the victims mental and physical state at that time, excavating this accident interrelated nature in order to serve as a reference in the prevention of future accident. The proposal in this literary work is ”Autopsy” and it scope. In discussing the meaning of it in accident investigation, the author introduces six advanced cases for research study in discussing the advantages of ”Autopsy” Besides referring to the experiences of the developed countries like Europe and U.S.A. also coordinates with our country's military pressing need for flight safety to overcome lack of forensic medical coroner and the problems faced by in the operation of ”Autopsy” Also aims in the breakthrough of autopsy legislation to the process of ”Flight Safety”.