version without radar and combat capability, in use since 1970. Su-15 (Flagon-D) Version with extended wingtips built since 1969. Su-15T (Flagon-E) Version equipped with Volkov Taifun radar. Su-15TM (Flagon-F) Improved Su-15T version equipped with Taifun-M radar and additional aerodynamic modifications, in use since 1971. New radome design for improving radar performances. Su-15UM (Flagon-G) Trainer version of Su-15TM without radar but with combat capability, built between 1976 and 1979. U-58UM Prototype of Su-15UM with Taifun-M radar, not entered serial production. Su-15Sh Proposed supersonic ground-attack aircraft, offered in 1969. Not built. Su-15-30 Proposed version sharing the radar and missiles of the MiG-25; not built. Su-15bis Converted Su-15TM with R-25-300 engines of 69.9 kN (15,652 lb) afterburning thrust for improved performance; approved for series production, but not built because of a shortage of the engines. Su-19 (T-58PS) Proposed advanced version with Tumansky R-67-300 three spool turbofan engines, each producing 78.44 KN of afterburning thrust. Sukhoi Su-19 would have ogival wing, improved avionics suite with new Look down - shoot down radar and additional pylons for missiles. Not built. Some Western reports indicate that the Su-15TM was also designated Su-21 and the Su-15UM Su-21U. These reports are apparently incorrect. Designation Su-21 was reserved for Su-17M4 but never used. Operators Soviet Air Defence Forces Russian Air Force retired all from front line duty in 1994, but some may remain in the emergency war reserve storage. Ukrainian Air Force retired in 1996. Specifications (Su-15TM) See also References Citations Bibliography Butowski, Piotr and Pankov, Valeriy and Ponomaryev, Vadim. Su-15 Flagon. Monografie Lotnicze #14. Gdańsk: AJ-Press, 1994 () (in Polish). External links Su-15 from FAS Su-15 from The Global Aircraft Organization Su-15 from Military Factory Su-15TM walkaround photos Another article about the Su-15 Su-15 1960s Soviet fighter aircraft Delta-wing aircraft Twinjets Low-wing aircraft Aircraft first flown in 1962