Preproduction T-50 and initial production batches of the Su-57 will use interim engines, a pair of NPO Saturn "izdeliye" 117, or AL-41F1, augmented turbofans. The engine is a highly improved and uprated variant of the AL-31 that powers the Su-27 family of aircraft and produces 93.1 kN (21,000 lbf) of dry thrust, 147.1 kN (33,067 lbf) of thrust in afterburner, and has a dry weight of approximately . The engines have full authority digital engine control (FADEC) and are integrated into the flight control system to facilitate maneuverability and handling. The AL-41F1 is closely related to the Saturn "izdeliye" 117S engine, or AL-41F1S, used by the Su-35S, with the latter's separate engine control system being the key difference.