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The Beriev A-50 (NATO reporting name 'Mainstay') is a Soviet-built Airborne early warning and control (AEW) aircraft based on the Ilyushin Il-76 transport. The existence of the A-50 was revealed in 1980 by Adolf Tolkachev. Developed to replace the Tupolev Tu-126 'Moss', the A-50 first flew in 1978. It entered service in 1984, with about 40 produced by 1992.