The requirements listed in Section 4 shall apply to all regularly assigned flight crew members. Due to limitations that it would place upon basic airplane design@ it is not considered practical for these requirements to apply fully to the so-called jump seat. However@ it should be emphasized that every effort should be made to provide the jump seat position with an equivalent level of comfort and safety. In drawing up the requirements for the crew members' seats@ the following items should be considered at all times. If the crew member is comfortable in flight he will be less susceptible to fatigue and can perform his duties in a safer and better manner. It is to be considered that when the crew member is occupying his seat he is on duty. Therefore@ all seat adjustments are for the purpose of fitting the seat to the different sizes and shapes of personnel in order to enable the occupant to do his work in the most efficient and comfortable manner. PURPOSE This document establishes the minimum requirements for@ and provides for standardization of@ seats for flight deck crewmen in transport-type a aircraft. In the preparation of this standard@ consideration was given to the requirements of the FAA@ the military specifications@ and the recommendations of the airline operators and the aircraft manufactures.