High Quality Content by WIKIPEDIA articles! The Yakovlev Yak-42 (NATO reporting name: "Clobber") is a 100/120-seat three-engined mid-range passenger jet. It was designed as a replacement for several obsolete Aeroflot jets as a mid-range passenger jet. It was also the first airliner produced in the Soviet Union to be powered by modern high-bypass turbofan engines.