The MiG-21UM (NATO Mongul) is a two-seat, single-engine trainer variant of the MiG-21MF (NATO Fishbed). It was developed in the late 1950s, was in production until 1972 and is the most produced supersonic fighter in history with approximately 11,500 rolling off of the assembly lines. Having served in over 60 countries, the MiG-21 remains in service in 18 air forces across the world. The aircraft is powered by a single afterburning R11-F2S-300 Tumanski engine capable of 13,600 lbs thrust in maximum afterburner. The MiG-21’s maximum weight is 20,900 lbs, it has no published service ceiling and has routinely operated in excess of 70,000 ft and Mach 2. The load factor limits are +7.0/-3 g’s. The NTPS MiG-21 is equipped with operational ejection seats and current pyrotechnics.