As was the case with many Soviet combat aircraft , including the MiG -31 and in the course of production has gradually introduced the first improvements. Made the conversion of hydraulic control systems for electronics. Has also been improved by increasing the engine power boost them through minor changes in the configuration of the turbine blades . Introduced a new generation of ejection seats K- 36DM Class 0 / 0 over the older KM- 1M. In the early 80’s plants in Nizhny Novgorod modernized one copy of the MiG- a31 , increasing the internal fuel capacity and simplifying production technology , leading to the formation of the first prototype of the MiG – 31M . Some design solutions implemented in serial aircraft MiG- 31B . MiG- 31B These attempts to enlarge the quantities of fuel were fixed point of the development of this structure. In the late 80’s launched serial production of the MiG – 3IDZ running refueling in flight. Receiver consumption on the MiG- 3IDZ is hidden inside the hull , as the rubber seals can not withstand the heat in the long flight speed of Mach 2.83 . Steps have also been made to extend the stay in the air for 10 hours , and extending the kind of comfort in both cockpits . Much less publicized event than desertion Belenki in 1976, was arrested in 1985 in Moscow Tax Fazotron plant worker who managed to convey to the U.S. part of the documentation relating to the complex S- 155M and RP- 31 radar curtains . Therefore, the Russians took up , as formerly in the case of the MiG – 25P, in a reconstruction of the MiG -31 MiG- 31B . The aircraft was modernized radar RP- 31A Curtains -A of the revised software and improved antenna. Also added the new missile R- 33S longer-range target tracking and head for greater resistance to electronic interference . For self- assembled ejectors traps UW -3A . Significantly improved avionics , data links and navigation systems . MiG- 31B can exchange information with other fighters , as well as ground-based stations . Reach new data link has quadrupled . The aircraft has far- navigation systems, radio systems Kwiotok A -723 -2 and satellite GPS navigation definitely improve reliability in high latitudes .Serial production of this variant was launched at the beginning of 1990 and until 1994 was built a few dozen aircraft . Currently gradually rebuilds the earlier produced MiG -31 variant of the MiG- 3IBS by using podzspołów familiar with the MiG – 31B . MiG- 31M Since 1983 he regularly worked on wspominanym over in a jiffy – 31M , designed for the latest system RP- 31M -M curtains and a new missile R -37 . The first prototype of the MiG- 31M was flown in the center . Zukowski, December 21, 1985 year by the B. Orlov and L. Popov . The most important changes have affected avionics and weapons systems . Modern Curtains -M radar used in Migue – 31M has a range of more than 400km . The new radar antenna has less weight and better performance than the previous one . Curtains -M is also characterized by more complex software , including . The aircraft was larger internal fuel tanks , new engines and a modified cockpit . Fighter takes about two tons more fuel his weight gain of 6 tons, and the drive unit are two engines D- 30F -6M for over 16,500 kg. A characteristic feature of the exterior is dog tags long fairing extending from the cockpit tray with parachutes inhibitors . Curtains -M radar can guide the latest long range missiles R -37 and medium-range R -77 . R -37 missiles are mounted under the fuselage in the amount of 6 pieces , and four R -77 can be mounted under the wings of the airframe . In October 1993 the MiG- 31M as the world’s first fighter shot down a missile R -37 airborne target at a distance of 240km . So excellent fire control system , combined with modern weapons significantly increase the fighting ability of the MiG – 31M , estimated by the designers at up to approximately 2.5 times higher than the initial MiG -31. The first flight of the new version was held in December 1985. To date, produced about 10 copies. Despite the excellent characteristics of the aircraft will not enter the service , because the Russians now plagued chronic lack of resources and the solutions used to Migue – 31M are no doubt very expensive, but some of the solutions to comply with the machines already in linear units . Construction of the MiG – 31M was used as the basis for the creation of a number of essentially derived varieties and specialty . MiG- 31D The construction of the MiG -3 airframe based M such design of a hypothetical satellite destroyer MiG- 31D . The plane was a modified version of the basic airframe . Before nasadami top large inflows of wings , the wings ońcach triangular vertical fins , and a drive unit adapted from the MiG – 31M . It was established as part of the ” Star Wars ” as the bearer of a special rocket developed przeciwsatelitarnej PRZE Wympieł office . Although created several prototypes , however, the desirability of the project was finally challenged . However, he returned to in the mid 90’s , the development of the civil jiffy – 31S . MiG- 31S This is one of the latest draft version of the MiG -31. It is a civil platform for launching into space, small commercial satellites , which is an adaptation of previously planned missile destroyer MiG- 31S . To this end, they provide missile Mikron , which will be light commercial satellite with a mass of up to 100 – 120kg into orbit around the Earth . It is also envisaged the use of the MiG – 31S when fired suborbital project rakietoplanów ARS ( Aerospace Rally System) , designed for training astronauts , test the atmosphere and apparently even for purely commercial and advertising tourist flights . MiG- 31BM Now preparing a new version of the MiG -31 , designated MiG- 31BM , having a model for modernization are in the service of the machines. Aircraft will receive a completely new avionics and weapons . The existing fire control system Curtain -A slot antenna receives upgraded with a range of 300km . This system acquires the ability to track a cell 24 at the same time and guidance to them eight rockets. Systems of the aircraft will also be adapted to the new weapons , including new missiles R- 37M , R- 77M , and 9M96 missiles from the system S -400 anti-aircraft . The cockpit , fitted with a new multi-function displays provide a more comprehensive overview of the situation of the battle for the two crew members to be in part analogous to the cockpit of the modernized MiG – 29SMT . MiG- 31FE It is a variant of the target export variant of the MiG- 31BM . The weapon set significantly enhanced with modern equipment air-to- ground : bullets przeciwradiolokacyjne CH- 31P or przeciwokrętowe CH- 31A , missiles televised CH- 59M or less Ch -59 or Ch- 29T (led TV) or CH- 29L ( guided laser ) . They can also be directed bombs KAB – 500kr or heavier KAB – 1500L ( guided laser beam ) or KAB – 1500T ( directed TV) . MiG- 31FE was in 1999 and in 2000, China’s National People’s demonstrated at an exhibition in Beijing. It shows clearly the efforts of designers aimed to significantly enhance a possible ” package” of a contract for the MiG – 31FE . Sam MiG – 31FE represents some trend to which the U.S. has , inter alia, Grumman F- 14D ” Bombcat ” which set of weapons also predisposes to perform ground attack missions . In Russia, the idea of reconstruction of MiG -31 multirole aircraft not yet received official approval , although more and more talk now about the creation of unified complex assault and data exchange , which may be used on any modern Russian combat aircraft . This may be even more important when there is a pressing need to fill the gap after the end assault aircraft SU- 17M4 and MiG- 27M and equality disparities hardware after the last reorganization. Anyway Standart work on the MiG – 31BM and upgrading to this level of equipment included in the service should maintain a high level of combat value until the complete withdrawal of all machines which , as already hinted above, there will be no earlier than about the year 2025/2030 . Severe interceptors will always play a responsible role in pańswie of such a diverse topography and Russia . Perhaps the flagship of the tasks performed today by the MiG -31 will slowly rest on the shoulders of the lighter SU -30 and SU -34 , characterized by a long range patrol and modern fire control systems . However, in combat missions , where the key requirement is a fast response to the identified risks and disposal of air cell at a very high altitude flight , and at high speed machines with characteristics MiG -31 for the time being, will act as a priority.