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In order to dealing with the influence caused by the continuous movement of the cargo and its sudden deplaning during airdrop operations, a novel flight controller based on the second-order terminal sliding mode control approach is designed. This method uses the feedback linearization technique to decouple the nonlinear airdrop model. On this basis, a second-order terminal sliding mode control law is proposed for airspeed and pith attitude control, which can guarantee robustness of the system. The overall flight control system is completed with the outer-loop altitude-hold control based on a PID controller. Simulation results show the good performance of the proposed control scheme.