The fundamentals of the chemotology of aviation fuels and lubricants (fuels and lubricants) are presented. Problems arising during aircraft operation due to quality of used fuels and lubricants are considered. Contains information about modern aircraft engines, fuel and oil systems. Influence of composition and properties of fuels and lubricants on reliability and service life of engines and their units is considered. Regulatory documents regulating the requirements for fuel and lubricants and the procedure for admitting domestic and foreign fuel and lubricants to use on aircraft are given. It contains information on methods and means of monitoring the physical and chemical composition, operational properties, quality control of fuels and lubricants.