The aircraft is prone to icing during the landing process, and the damage caused by icing to flight safety is extremely serious. The danger caused by icing to the aircraft is because that the aerodynamic behavior changes after the wing or tail is covered by the ice layer, and the aircraft is extremely difficult to control. In order to analyze the stability of the aircraft after icing and ensure the safety of the flight, the longitudinal dynamic system of the aircraft is taken as the analysis object, and the description of the state after the icing of the aircraft is carried out in the form of a reachable set, which is used to judge whether the state of the aircraft is controllable visually. All of this determines if the aircraft is in a safe state. Based on the reachable set obtained by the solution, the extreme value theorem is used to analyze the risk probability model of the icing aircraft. The model calculates the risk probability of the aircraft under different conditions, then it could obtain the safety risk assessment result of the aircraft during landing stage. Control of the driver is guided by the evaluation result, which ensures safe flight of the aircraft.
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