A. The purpose of this manual is to instruct all flying personnel in the following: (1) Those physiological aspects of flying which are detrimental to the normal functioning of the human body. (2) The preventive or corrective measures to he taken to avoid or overcome these detrimental aspects. (3) The necessity for maintenance of the required high standard of physical fitness for the proper performance of flying missions. b. Incidental to its main purpose, the information compiled in this manual may serve to determine the causes of otherwise inexplainable accidents to aircraft and their crews. Likewise, through the intelligent application of the preventive and corrective measures outlined herein, recurrence of such accidents can be avoided.