FIELD: mechanical engineering; gas-turbine engines. SUBSTANCE: invention provides faultless surgeless operation of engine owing to by-passing of air from inner circuit of engine into outer circuit in of mismatching of programmed and actual angles of positions of vanes of compressor inlet guide vane assembly exceeding maximum tolerable value. For this purpose actual angle of position of vanes of compressor inlet guide vane assembly αigais compared with corresponding programmed value α
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