Probable model of SPTA system

Considering complex structured systems for ensuring the reliability of technical means, numerical calculations of sufficiency indicators of spare parts sets and their readiness factors for use are often performed. These parameters of the functioning of spare parts systems, tools and accessories (SPTA) often have to be recalculated in order to solve the problem of system optimization. Each new  iteration requires massive calculations to determine whether the level of these parameters meets the established requirements. To solve problems of optimization of quantitative parameters of spare parts, it is more expedient to use a single indicator of the effectiveness of the use of spare parts. One of these parameters could be a probability of servicing a request at the levels of downsizing of the SPTA system. However, in this case it is necessary to understand the principles of formation of flow parameters in the system, and also to find their suitable interpretation for a commensurately accurate calculation of the parameters.