Abstract: Air inlet structure integrity assessment is the key technology of aircraft design in order to guarantee the safety of aircraft during the whole life time. Presenting the characteristics of advanced air inlet structure and loads, researching the air inlet structural layout and detail design technologies based on geometry nonlinear analysis technique, and the sonic fatigue test specimen design and sound load spectrum determination technologies are the main contents of the paper.The strategies of solutions are developed and the application example is given.

Key words: structural mechanics of flight vehicle, aircraft structure integrity, air inlet, sonic fatigue, geometry nonlinearity