VaSIlIy logINoV, yeVgeNIy UkraINteS kharkiv air Force University named after Ivan kozhedub, 77/79 Sumskaya str., 61023, kharkiv, Ukraine login_ov@ukr.net, eUkrainetz@ukr.net abstract a comparative analysis of aviation diesel and gas turbine engines in the light passenger aircraft system was conducted. aircraft operational characteristics were obtained with the help of developed modular software system "Integration-2.1". For the formation of 5-9 seater modifications of aircraft as a prototype

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... taken aircraft Diamond Da42 with the location of passengers without aisle, crew consisted of 1 person. For the formation of 10-20 seater aircrafts modifications as prototypes were taken aircrafts eV-55 and l-410UVP, the crew consisted of 2 persons, was adopted the full completion of aircraft equipment, power plant consists of two engines was adopted. It shows the economic advisability of the aircraft gas turbine engines use for airplanes of local airlines (5-6 people). It was found that the life-cycle cost of the aircraft with more passengers become lower in modifications with gas turbine engines, therefore, the use of this type of engine is advisable for aircraft with greater passenger capacity. It was found that the main factors influencing the life-cycle cost of the aircraft, are the resource characteristics of the engine, the cost of its maintenance and repair, as well as the price of fuel.