The Su-20 jet is also known as Su-17M, S-32M, S-32MK, S-32MKI or according to NATO nomenclature Fitter-C. The main advantage of the plane is capability to change wing area that results in very good performance at the air and ground combat field. It has AL-21F3 engine. The plane is capable to take 4.000 kg of external load (bombs, tanks - enlarging range of operation - and containers with additional guns, reconnaissance equipment or specialised electronic & opto-electronic equipment for guided rockets).