Abstract: he main purpose of this paper is to introduce some efforts of the“Analvtical investi- gation of the aircraft flight loads”,which was one of the research tasks of the aircraft strength specification in the period of the seventh-five year program. Analytical results shown in this pa- per include:flight envelopes,manuvering histories,static elastic correction,aerodynamic loads and inertial loads,loading balance of the aircraft,bending moments,torsion moments and shear- ing loads at specified cross sections of the airframe. All these results were studied and compared with the original design loads conditions of the fighter aircraft. In addition,some points of view about further investigation and implementation of the“NATIONAL MILITARY SPECIFICA- TION OF TNE STRENGTH AND LOADS”are presented.

Key words: aerodynamic loads, uynamic load, aircraft envelops flight envelope