The company said in a statement that Belyakov died yesterday in Moscow following an unspecified illness.
Belyakov became the MiG chief designer in 1969, succeeding the firm's founder, Artyom Mikoyan, and led the development of a family of MiG fighters, including MiG-23, MiG-25, Mig-29 and their versions, which have been the backbone of Soviet and then Russian air force.
Belyakov joined the MiG company as a young engineer in 1941 and quickly rose through the ranks to become a deputy chief designer in 1957.