tass.com
Russia's Su‑57 flies first sortie with Izdeliye (Product) 177 engine, launching flight‑test campaign
United Aircraft Corporation said flight tests have begun of the Izdeliye 177 (Product 177) engine on a Su‑57, initiating a dedicated propulsion flight‑test campaign after more than a decade of development. United Engine Corporation and Rostec are cooperating, and UAC is expanding production capacity to raise Su‑57 deliveries.
