4th Engineer (Четвертый механик) / Motorman (Моторист) / Officer in charge of an engineering watch in a manned engine-room or as designated duty engineer in a periodically unmanned engine-room on ships powered by main propulsion machinery of 750 kW propulsion power or more (Вахтенный механик морского судна с ГДУ 750 кВт и более) / Ratings as able seafarer engine in a manned engine-room or designated to perform duties in a periodically unmanned engine-room (Моторист первого класса) / Third Engineer (Третий механик)