To support the creation of engine overhaul workscope during its life cycle

and reduce the overhaul cost in its life cycle

based on the engine maintenance management program provided by manufactures

by setting the overhaul interval which is less than the maximum overhaul interval

and taking account of the life of life limited parts and soft time of modules

an engine overhaul cost optimization model was presented in the paper for a modular engine

which took the overhaul interval as the variable and the least shop visit cost per flight hour as a target

the genetic algorithm was used to solve this optimization problem. Taking V2500 as an example

its shop visit workscope was optimized

it gave that 6 shop visits in 25 years have the lowest cost

and the repair levels of each module were also created for each shop visit. It can provide a reference method for airlines to make engine workcope for shop visit.