Prof., Józef Błachnio Ph.D., D.Sc., Eng. is an employee of the Aviation Engines Department of the Air Force Institute of Technology, 6 Księcia Bolesława Street, 01-494 Warsaw, Poland, E-mail: jozef.blachnio @ itwl.pl. He deals with the reliability and especially the serviceability of aircraft jet engines. He is a co-author of research projects concerning: - Development and implementation of the TBC coating for the combustion chamber; - Assessment of the suitability of the exploited coatings for gas turbine blades.