Russia Tests New Product 177 Turbofans On Su-57 Stealth Fighter Jet

Russia’s Su-57 stealth fighter jet has achieved a pivotal fifth-generation milestone with the successful first flight of its new Product 177 engine. ROSTEC, the Russian state corporation, confirmed on 22 December 2025 that the aircraft, piloted by honoured test pilot Roman Kondratyev, completed the sortie without issues.The engine operated in normal mode, or normal parameters, marking the
Russia’s Su-57 stealth fighter jet has achieved a pivotal fifth-generation milestone with the successful first flight of its new Product 177 engine. ROSTEC, the Russian state corporation, confirmed on 22 December 2025 that the aircraft, piloted by honoured test pilot Roman Kondratyev, completed the sortie without issues.The engine operated in normal mode, or normal parameters, marking the
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