Ecureuil AS 355N is a multipurpose helicopter. It is equipped with two engines Turbomeca ARRIUS 1A. In hot weather and at the high altitude, given hanging IGE, it can, with the maximum gross weight onboard, fly up to 1,800 m according to ISA + 20C. With one engine running, the speed of diagonal flight levitation with the maximum gross weight according to ISA +20C = 2 m/s at the sea level.The helicopter is characterized by active usage of composition materials in the frame and rotating parts. Underlying structures are made of pressurized components, light alloys.