Method of Spare Parts Inventory Decision on the Aircraft Integrity Performance

The aircraft integrity rate is a comprehensive indicator reflecting the performance of the aircraft integrity, and it is also a comprehensive evaluation index that reflects the quality of the objectives of the spare parts supply support system. The disadvantage of using the spare parts satisfaction rate or the expected number of stocks as a systematic evaluation indicator is that the indicator only stays in the supply system and does not go beyond the supply system to consider the impact of the supply system on the aircraft or other spare parts. Calculating aircraft uptime assesses the aircraft's ability to continue operation by combining resources over a period of time with the aircraft's combat capabilities. The aim is to determine which spare parts are prioritized for storage in order to obtain optimal aircraft uptime indicators under the condition of funding caps. But for accurate forecasting of spare parts demand, the distribution status of spare parts that generate demand must first be determined. In this paper, combined with the analysis of the statistical probability distribution characteristics of spare parts demand, taking the total cost budget constraint and the maximum spare parts satisfaction rate as the decision-making goal, this paper proposes a model for spare parts storage optimization decision that meets the optimal goal of aircraft integrity, and gives a solution algorithm of marginal analysis. The example application has verified the feasibility and practicality of the model. The model combines resources over a period of time with the aircraft's flight capabilities to assess the aircraft's ability to continue to fly in a steady-state environment. It can plan the uptime of the aircraft according to a given spare parts inventory, or it can calculate the amounts of spare parts required to complete the flight training plan task under a specified performance standard. It has solved the problem of determining which spare parts are prioritized for storage in order to obtain the maximum aircraft uptime under the constraint of limited funds.