The problem of processing the initial data of regular measuring systems of gas turbine plants for creation an automated system for assessing the technical condition of the plant under operating conditions is solved. In the future, such a system would allow reducing the part of thermal tests and approaching the system of equipment maintenance according to technical condition. As a result of the study, a mathematical algorithm is proposed that forms sets of measurements of steady-state modes from the initial data, according to which the coefficient of technical state is determined. Using the Python 3 programming language, a software package was created, with the help of which a study of real operational data are carried out and recommendations for engineering practice are developed.