Abstract: The equations of motion for both aircraft and external store in atmospheric turbulence are established in this paper. The calculating method of aerodynamic forces and moments acting on an external store in consideration of the aircraft interference aerodynamic field is described. The method of calculating the external store trajectories relative to the aircraft and the method of determining the separation safety after the release of external store are presented. At last, taking the seperation of an empty auxiliary fuel tank under the fuselage of a fighter as an example, the separation safety of this external store in atmospheric turbulence field is investigated.

Key words: seperation of extenal store from an aircraft, separation safety, atmospheric turbulence, aerodynamic interference