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As sustainable aviation fuels are one of the mid and long term solutions for aviation emissions reduction, these article focuses on jet engine performance with different HEFA-SPK blends. Blends used in the tests were 30% and 50% of HEFA-SPK fuel and also pure Jet A-1 as a conventional fuel. Experiments were carried out on a miniature jet engine GTM 400 and the aim was to assess the impac of SAFs on operationel parameters.Selected engine performance parameters were calculated and analyzed for tested blends. One of the results are that the blend of HEFA-SPK led to a average improvement of thrust-specific fiel consumption by about 3%, and increase of static thrust by 2.7-11.2%