The longitudinal attitude of transport aircraft would be changed by cargo extraction during airdrop at super-low-altitude,which will affect the aircraft safety and success of airdrop. According to the feature of multi-state system of the aircraft,the state-feedback control law has been designed by LQR method to control the elevator to produce force and moment,thus eliminating the disturbance of cargo extraction so as to ensure the aircraft's longitudinal stability and improve the safety of airdrop. The simu...