First flight of Su-27 aircraft serial sample took place on this day 40 years ago

The construction of fighter first sample in Т-10С variant, afterwards named as Т10-7 (or – Т10С-1, serial No.04-03), was finished at the Plant named after P. Sukhoi in the end of 1980.

April 20, 1981 test pilot S. Ilyushin put the aircraft to the air. The flight was successful. Т10-7 and Т10-12 aircraft were used to determine main flight and technical parameters, stability and control features of new-design-aircraft as well as evaluation of new power units with upper wheelcases.