MIL-S-6551A, MILITARY SPECIFICATION, SEAT, CREW, DOWNWARD EJECTION, AIRCRAFT (21 SEP 1981)

MIL-S-6551A, MILITARY SPECIFICATION, SEAT, CREW, DOWNWARD EJECTION, AIRCRAFT (21 SEP 1981)., This specification establishes the requirements for two types of aircraft adjustable crew seats for downward ejection.