Yak-28I was adopted in 1962. The aircraft was equipped with the integrated system of the armament control consisting of a radar station 'Initsiativa (Initiative) 2', an optical sight OPB116 and an automatic pilot AP-28K. With it’'s help the crew could retrieve and attack pin-point mobile targets at any time of a day and a hard meteorological conditions. In all 223 aircraft of this modification were built.