The methodical guidance is devoted to the analysis and subsequent calculation of the operational reliability of aviation equipment. Quantitative and qualitative indicators of the reliability of equipment and systems, methods of maintaining equipment in working condition are considered. The issues of reliability analysis based on data on failures and malfunctions in operation are considered. Examples of calculating the reliability characteristics of aircraft products for various observation plans and reference materials necessary for calculations are given. At the end of each section, examples of problem solving and control questions are provided to consolidate the material and independently verify knowledge. The methodical guidance is intended for students studying in the bachelor's degree program 6B07101 «Technical operation of aircraft and engines». It can be recommended to engineering and technical personnel involved in the maintenance, repair and testing of aviation equipment.