Operation, maintenance and repair of aviation equipment is associated with the use of a variety of materials, products, working fluids, compressed gases and other substances. Their correct use contributes to an increase in the level of technical operation, an increase in the service life and reliability of aircraft. The book gives the physicochemical and mechanical properties of steels, non-ferrous alloys, alloys based on nickel and refractory metals, cermet materials, plastics, preservation and detergent liquids, fuels and lubricants, and others. When using different materials, it is necessary to take into account specific operating conditions, i.e. the nature of loading, temperature, composition and properties of the external environment, altitude and carrying capacity of aircraft. Therefore, this handbook contains not only digital data characterizing various materials, but also recommendations on the technology of use and rational use in the operation, maintenance and repair of aircraft.