MiG-31BM
After passing state testing in 2008, this modernized variant of MiG-31B was approved for introduction into air force of Russia. 50 planes are modified to the MiG-31BM (Bolshaya Modernizatsiya/Big Modernization) standard, in accordance with the 2011 contract. The efficiency of the modernized MiG-31BM is 2.6 times greater than the basic MiG-31. The MiG-31BМ’s maximum detection range for air targets was increased in the upgrade to 320 km (200 mi). It had the ability to automatically track up to ten targets, and the latest units can track up to 24 targets and simultaneously engage up to eight targets. The on-board Argon-K is replaced with the new Baget 55-06 computer[83] that selects four targets of the highest priority, which simultaneously are engaged by long-range R-33S air-to-air missiles.[84] A new long range missile R-37 (missile) with speed of Mach 6 and range up to 400 km (250 mi) is developed during the modernization process for use with the newly modernized MiG-31. The MiG-31BM has a multi-role capability, and is capable of using anti-radar, air-to-ship and air-to-ground missiles. Some of its avionics are unified with the MiG-29SMT. It also has a refueling probe. MiG-31BM set a sustained flight record for the model while spending seven hours and four minutes in the air while covering the distance of 8,000 km (5,000 mi).
MiG-31BSM
An upgrade of the BS version, it is the latest modernization variant first time contracted in 2014 for modernization of 60 aircraft, it is very similar in some aspects to the BM standard. Unlike the BS standard, aircraft modernized into the BSM standard are equipped with air refueling probe. Improvements were made to the aircraft canopy, where new and better heat resistant glass was used, thus enabling the MiG-31BSM to fly with cruise speed of 3,000 km/h (1,900 mph) at long distances without any damage. Furthermore, new faster central computer Baget-55-06 is used with addition of multi-functional displays, one for the pilot and three for the weapons operator-navigator. Also there is a new set of navigation equipment. The MiG-31BSM has multi-role capability with ability to use anti-radar, anti-ship and air-to-ground missiles. Main visible difference between the BS and BSM standards is adding of the rear-view periscope above the front cockpit canopy.
