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In order to ensure the safety and reliability of civil aircraft structures, the present paper focus on determination of detectable fatigue crack length by improved Analytic Hierarchy Process (AHP) method for civil aircraft structures. By rating the impact of various factors, fatigue damage such as detectable cracks are considered to establish a rating system, and apply improved AHP for overall ratings each index draw total level. On this basis, according to the regression equation of total level and basically detectable crack length derived the size of basically detectable crack. In the example of this paper, the basically detectable crack length derived by the improved method compared to the length derived by unimproved method shortened 2mm. The result indicated that the improved method can avoid overly conservative due to maintenance intervals developed and save maintenance costs. This research provides a theoretical basis for airlines to develop an economic and reasonable structural fatigue damage inspection interval according to the actual situation of the aircraft. Keywords—Aircraft Structure; fatigue damage; basically detectable crack; analytic hierarchy process; inspection interval

Determination of Detectable Fatigue Crack Length by Improved AHP Method for Civil Aircraft Structures