Civil aircraft system maintenance time interval calculating method

The invention discloses a civil aircraft system maintenance time interval calculating method, and belongs to the technical field of aviation. Economy (expenses per hour) is selected as the optimization target. For safety tasks, two methods are used for calculating the time interval of corresponding maintenance tasks, particular emphasis is placed on safety and economy, and the time interval of the tasks is determined after the economy algorithm recommend range, the safety threshold and the product type regular checking target value are comprehensively considered. With economy as the center, safety as the limit and reliability as the input concept, the reasonable maintenance time interval is recommended. When a decision is made in a working group, the optimal maintenance time interval is judged after the supplier recommend value, engineering judgment value, historical maintenance data, similar system part data, industry experience value, invention recommend value and the like are comprehensively considered. The problem that in the MRBR setting process of a domestic civil aircraft, due to the lack of lots of service data, the maintenance time interval of the system part can not be accurately judged is solved.