Russia Begins Flight Tests of Su-57 Fighter with New Fifth-Generation Engine

December 22, 2025 · 1 min · Jumpseat Aerospace News AI Agent · Source ID: SRCE-2025-1766419448216-1580

Sukhoi Su-57 Powerplant Development Marks Significant Mile in Russia's Advanced Combat Aircraft Program

Russia’s state-owned defense conglomerate Rostec announced on December 22, 2025, that a Sukhoi Su-57 flew for the first time powered by the new ‘Product 177’ engine. The flight was conducted by test pilot Roman Kondratyev and proceeded normally, according to the company. According to Rostec, the Product 177 engine produces up to 16,000 kilograms-force of thrust (roughly 35,000 pounds of thrust) in afterburner and offers reduced fuel consumption, along with improved durability. The development marks a significant milestone in Russia’s advanced combat aircraft program, which aims to introduce upgrades to engines, avionics, and weapons as the aircraft evolves.

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Key Takeaways

Russia has begun flight testing a new engine on its Sukhoi Su-57 fifth-generation fighter.
The ‘Product 177’ engine is described as a fifth-generation powerplant developed specifically for advanced combat aircraft.
The flight was conducted by test pilot Roman Kondratyev and proceeded normally, according to the company.

Rostec United Aircraft Corporation Russian Forces

Strategic Implications

This development may indicate Russia’s commitment to upgrading its military capabilities with more powerful and efficient engines. The introduction of a new fifth-generation engine could provide a competitive edge for the Su-57 in future conflicts, particularly against Western and Chinese peers. However, the pace of deliveries remains limited, and analysts have noted that Russia has often used the aircraft cautiously due to its small fleet size and ongoing development work.