@sukhoi_aircraft_company su-57 before starting up on tarmac as ground crew prepare it for an air display. Fact check: Su-57 Stealth Jet Engine Start-Up & Warm-Up Procedure Power-Up & System Checks – The Su-57's engine start-up begins with the Auxiliary Power Unit (APU) activating to provide electrical and hydraulic power. The pilot runs diagnostics on avionics, flight controls, and stealth systems to ensure optimal readiness. Twin Engine Ignition & Stabilization – The NPO Saturn Izdeliye 30 engi