english: A first prototype was then built, it first flew on December 14 1977 Operational trials in the Soviet army began in early 1982, it entered service the following year.
non_english: A prototipe pisanan iki banjur dibangun, pertama kali terbang ing trials Operational Desember 14 1977 ing tentara Soviet wiwit ing awal 1982, iku mlebu layanan ing taun iki.