In recent times, spare parts inventory systems have been extensively researched, but most inventory models were not fully adequate\ndue to the stochastic nature of inventory environment. This paper proposes an approach that supports decision making process\nin planning and controlling of spare parts in aircraft maintenance systems. Reliability characteristics of aircraft consumable parts\nwere analyzed in order to substantiate this approach.Moreover, the proposed reliability model was used to evaluate characteristics\nof subassemblies and/or assemblies these parts belong to. Finally, an innovative approach for determining the total amount of parts\nrequired in inventory and underage costs, based on observing the total unit time as a stochastic process, is presented herein.
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