Interceptor developed from the Mig-25. Project under designation MiG-25MP initiated in 1972, and first flight (test-pilot A.Fedotov) took place on September 19, 1975. In mass production since 1979, more than 500 MiG-31 and MiG-31B built. Two-seat aircraft has a re-designed lighter airframe (see table). Missile armament was almost doubled with 4 catapult launchable missiles and powerful cannon added.
The first (and the only at the 1996) mass production interceptor in the world equipped with fixed Pulse-Doppler radar, allowing simultaneous tracking of 10 targets and firing against four of them. An unit of four MiG-31 can link their radars together, to establish a search pattern - covering a width of 800-900km with four aircraft, spaced at 200km. MiG-31 may also serve as an airborne command center to guide fighters with less powerful radar equipment (MiG-23, MiG-29, MiG-21-93).
Landing gear allows to use MiG-31 from unpaved airstrips.
| Technical Data | Photos |
| Role | Long-range interceptor | | Ceiling, m | 20,000 | | Range with max.payload, km | 1,200 | | Range with max.fuel, km | 3,000 | | Cruise speed, kmph | 2,500 | | Max speed, kmph | 3,000 | | Empty mass, kg | 21,825 | | Maximum take-off mass, kg | 46,200 | | Wing area, m2 | 61.6 | | Wingspan, m | 13.5 | | Lenght, m | 22.7 | | Engines | 2 Perm D-30F6, 151,9kN | | Crew, prs | 2 | | 
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