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"In September 1962, the design bureau OK-155 started to design a new MiG-23PD aircraft. The development of the fighter started after the CPSU Central Committee issued a decree, under which such variants had to be considered: the aircraft powered by the RD-36-35 lift engines and by the R21F-300 and R27F-300 power jet engines. The MiG-21 PFS was modified into the experimental Ye-7PD to test the engines. The fuselage became 900 mm longer to house the two jet lift engines mounted after the cockpit. The Ye-7PD made its maiden flight on 16 June 1966. The Ye-7PD (23-31) aircraft demonstration at the Domodedovo Air Parade in 1967 was its moment of glory. Tested takeoff and landing device found use in the Yak-38 aircraft. After the researches were finished, the 'MiG' was given to the Airplane Design Department of the Moscow Aviation Institute as an educational aid."