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Prime contractor: Mikoyan-Gurevich Design Bureau
Country of origin: Soviet Union
Function: Strategic interceptor fighter 
Crew: 2
Year: 1975
In-service year: 1982
Engine: Two Aviadvigatel D-30F6 afterburning turbofans
Thrust: 34,100 lb. each 15,500 kg. each
Wing span: 44 ft. 1 in. 13.46 m.
Length: 74. ft 4 in. (including nose probe) 22.69 m. (including nose probe)
Height: 20 ft. 2 in. 6.15 m.
Empty 48,015 lb. 21,825 kg.
Max. takeoff 101,640 lb. 46,200 kg.
Ceiling: 67,568 ft. 20,600 m.
Speed: 1,863 mph 3000 km/h
Range: 1,326 miles (on internal fuel)
2,050 miles (with fuel drop tanks, no missiles) 2,135 km. (on internal fuel)
3,300 km. (with fuel drop tanks, no missiles)
One GSh-6-23 six-barrel Gatling-type 23mm cannon with 260 rounds. Max. external weapons load (FE version) of 9,000 kg. (19,800 lb.) including R-33 ("AA-9 Amos"), R-40TD ("AA-6 Acrid"), R-77 RVV-AE ("AA-12") AAMs., Kh-31P-31A ("AS-17 Krypton"), Kh-25MP-25MPU ("AS-12 Kegler"), Kh-29L/T ("AS-14 Kedge"), Kh-59 ("AS-13 Kingbolt"), Kh-59M ("AS-18 Kazoo") ASMs., KAB-500, KAB-1500 guided bombs, FAB-1500 unguided bombs.
Typical interceptor configuration: Four R-33 (AA-9 "Amos"), two R-40T (AA-6 "Acrid"), or four R-60 (AA-8 "Aphid") AAMs.
Known Variants
MiG-31B, MiG-31BM, MiG-31BS, MiG-31D, MiG-31E, MiG-31EH, MiG-31F, MiG-31FE, MiG-31LL, MiG-31M, MiG-31MF, MiG-31S
Aircraft's Price
1997 - est. $57-60 millions.
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