the tu-330 was to have a swept high-mounted wing design with two high-bypass ratio ps-90a engines mounted below the wings. an optional powerplant system has also been proposed, using nk-93 engines that can operate on lng (liquefied natural gas) fuel. the aircraft was also designed for commonality with the tu-204/tu-214 civilian airliner series, in order to simplify production and minimize costs of manufacturing, maintenance and parts.