 Bench testing of the new engine will start in 2014 according to the general designer-director of the NPO Saturn Eugeny Marchuk.Serial production began in April 2019.Intended to power the Su-35BM, the "izdeliye" 117S, or AL-41F1S, is derived from the AL-41F1 of the Su-57, with the key difference being the separate engine control system of the AL-41F1S.