Experience gained from the participation of MiG-21 aircraft in combat over the Middle East and Vietnam demonstrated the need to improve the aircraft’s characteristics in combat at low and medium altitudes and to extend
its range, while maintaining the existing weapons payload. Thus the fourth-generation version was created — the MiG-21 bis, which was produced between 1972 and 1982. A total of 2030 examples were built.
Externally, the aircraft resembled the earlier MiG-21MF. The main changes included an internal fuselage structure of lower weight and increased strength, internal fuel tanks of greater capacity, a new R-25-300 engine with a special operating mode known as “second afterburner” that improved performance at low altitudes, and an RSBN navigation and instrument landing approach system. The highly manoeuvrable R-60 missile, guided by infrared sources, was added to the aircraft’s arsenal.
The MiG-21 bis saw combat in Afghanistan and was used by Iraqi air force in the war with Iran in 1980-1988 and in the Gulf War in 1991. During the Iran-Iraq War, a number of MiG-21s were adapted to carry
French Matra Magic missiles. Despite modifications, the aircraft’s greatest weaknesses could not be eliminated: short range, low weapons payload, and poor radar performance.
Poland purchased 72 aircraft, delivered between 1980 and 1981. They were withdrawn from service in 2003. The example with factory number 75089204, built at the aircraft factory in Gorki, was delivered on 14.07.1981. It was operated by the 26th Fighter Aviation Regiment (from 1989 the 9th FAR) in Zegrze Pomorskie, and towards the end of its service was with the 3rd Tactical Aviation Squadron in Poznan-Krzesiny. It was withdrawn in January 2004.
| Wingspan | 7.15 m |
| Length | 14.10 m |
| Takeoff weight | 8725 kg |
| Maximum speed | 2175 km/h |
| Ceiling | 17800 m |
| Range | 1225 km |
| Armament | GSz-23L cannon, 4 R-3S, R-3R or R-60 missiles, rocket launchers or bombs |
| Engine | turbojet R-25-300 with thrust of 7100 kG |
