The purpose of this article is to study the features of the usage of jet fuels for aviation gas turbine engines and the importance of the chymotology for the study of aviation kerosene and technical fluids usage in the of modern aviation technology. The role of practical aviation chymotology in ensuring reliable operation of aviation equipment and functional application of fuel and lubricants and technical fluids in existing and future aviation equipment is revealed in the work. In the present time jet fuels of both domestic and foreign production are supplied to meet the needs of the Air Force. The main tasks of chemical engineering are: the study of the processes that take place in the use of fuel on modern aircraft and the justification of requirements for the level of quality of aviation jet fuels and the assessment of the possibilities of its use, the development of the approaches of the optimization of the fuel quality, unification and standardization of quality assessment methods. Modern aviation jet fuels are produced from oil in the process of direct distillation on atmospheric tubule or on an atmospheric vacuum tubule and purification of the kerosene fraction with the addition of the necessary additives in order to improve performance. Thermal stability is important for jet fuels, especially for supersonic aviation fuels, since in modern aircraft with supersonic flight speed airfield heating of aircraft structures to high temperatures takes place due to adiabatic air compression in front of the aircraft. The surface temperature of the aircraft at a speed of 3 Mach can reach +330oC , and at 4 Mach can reach + 630oC. The main direction of improving the thermal stability of jet fuels, especially for supersonic aviation, is to improve the design of aircrafts and aircraft engines, as well as to improve the quality of jet fuels. The main ways of increasing of the thermal stability of jet fuels are changes in the technology of fuel production, an improvement of cleaning technologies, the use of more efficient additives, the use of fine filtration of nitriding of fuels and fuel pre-cooling. Keywords: fuel and lubricants, technical fluids, practical aviation chemistry, quality control, operational properties, gas turbine engine, efficiency and reliability of operation, physicochemical properties.