AI-9 Gas-Turbine Engine - selling. is used as a ground and in-flight power source, effecting the supply of compressed air to the starting system of the Yak-40 aircraft engine and of the Mi-14, Ka-27, Ka-28, Ka-29, Ka-32, Ka-32A, Ka-50, Ka-52, Ka-62 helicopter engines. PECIFICATIONS Rated rotational speed, min-1 38500±500 Amount of air bled,