A separate multinational company, Turbo-Union, was formed in June 1970 to develop and build the RB199 engines for the aircraft, with ownership similarly split 40% Rolls-Royce, 40% MTU, and 20% FIAT.
Pre vývoj a výrobu motorov RB199 bola v júni 1970 založená samostatná spoločnosť Turbo-Union, so 40% podielom spoločnosti Rolls-Royce, 40% podielom MTU a 20% podielom FIAT.