Optimization model of spare parts inventory for civil aircraft based on marginal utility

In order to maximize the guaranteed effect of spare parts for civil aircraft and optimize the inventory level of each item, an optimization model of the inventory was presented to optimize the mean maintenance latency time of aircraft, the provision cost of total spare parts was taken as the constraint of the model, and the technical characters, economic characters and provision parameters of spare parts were taken into account.A heuristic algorithm was given to solve the model based on the marginal utility analysis of spare part unit cost, so that the optimum project of the inventory was found.Compared with the result calculated by item approach, the mean latency time caused by the shortage of spare part is shortened by 11.5%, and spare part budget is reduced by 27.5%, so the model is validate and effective to economize inventory cost and improve the use level of aircraft.