The analysis of the approaches to the development of the general methodical apparatus for the spare tools and accessories amount substantiation and their stock-list formation for the advanced flight servicing radio-technical facilities during their exploitation is performed in the article. The possibility of the spare tools and accessories list optimization and its compiling for the required reliability indexes providing is substantiated basing on the logical-probability method appliance in the new application domain of the weaponry reliability indexes evaluation and estimation of the certain hardware component significance and its contribution to the flight servicing radio-technical facilities construction and their functionality. The mathematical apparatus and the algorithm for the concerned problem solving are suggested.