Abstract: As an important quality characteristic parameter of combat aircraft, survivability plays a critical role in sustaining operational integrity and operational effectiveness during the service period of the aircraft. Taking into account hostile threat effectiveness in actual battle environments and combat chains, this paper proposes the concept of generalized survivability of combat aircraft, which is defined as the aircraft's ability to survive the hostile environment when the aircraft is carrying out combat missions in the hostile environment. The generalized survivability of combat aircraft consists of hostile threat effectiveness, aircraft susceptibility and aircraft vulnerability, and has some special characteristics such as objectivity, relativity, randomness and controllability. Then the model of generalized survivability of combat aircraft is built, and the evaluation method is provided. The definition of hostile threat effectiveness is proposed, which consists of hostile threat activity, hostile threat integrity and hostile threat performance. The definitions of hostile threat activity and hostile threat integrity are also given. Furthermore, it is proposed that combat aircraft susceptibility consists of aircraft detectivity and aircraft evadability, and the definitions of aircraft detectivity and aircraft evadability are given. Finally, how to improve the generalized survivability of combat aircraft is also suggested. The evaluation results of the generalized survivability of four modes of combat aircraft are shown. The results and conclusions of this study can help the design and operation of combat aircraft in the future.

Key words: aircraft, survivability, hostile threat, effectiveness, susceptibility, evadability, vulnerability, evaluation