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The article deals with the problems of engineering support of the main indicators of reliability (durability) for the shape elements of molds. The influence of geometric, physico-mechanical, and physico-chemical parameters of surface quality on the formation of the required service characteristics of mating parts that ensure the established operating time of the product for failure is studied. The results of the influence of ion-plasma treatment on the structure and phase composition are presented: 1.2344 and 1.2379 tool steels (DIN). It is evaluated that the glow discharge treatment leads to the erosion of the fingerprints, appearing in the process of nitriding of this type of steel and it also causes thickening of defects in the matrix phase α-Fe together with fine grading CrN, as well as the dispersion of carbide inclusions and their uniform distribution in the surface layer to a depth of up to 80 microns, resulting in the increase of the microhardness of the surface by 15 - 18 %.

The paper reports the results of investigations on technological support of reliability indices for as-sembly units taking into account changes of contacting functional dimensions of single machine parts at the operation stage. At the heart of the work there is an analysis of dimension ties of an assembly unit ensuring a correlation between some basic stages of a product life cycle at which product quality is formed: designing with the quality parameter standardization of a surface and functional dimension accuracy, manufacturing with the definition of technological parameters and confirmation of accuracy achieved at separated operations and an operation at which changes of quality and accuracy parameters takes place.

The article considers a complex calculation and experimental method for evaluating the reliability of aircraft technical systems at the design and development stages of prototypes. The forecasting of reliability of technical systems by analytical methods is given. A brief presentation about mathematical modeling of products is given. Operational and bench accelerated tests of technical systems are considered. The necessity of complex analysis of analytical forecasting methods, operational and bench accelerated tests is shown to assess the reliability of technical systems of aircraft during the design and development stages of prototypes.