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Ram Air Turbine

A Ram Air Turbine, a small propeller-driven generator, is depicted against a black background, showcasing its sleek design and the blades spinning to harness wind energy.

A small propeller-driven generator stowed in the belly or wing of most modern airliners, deployed automatically when an aircraft loses both engine-driven power sources. Spun by the slipstream, it produces enough hydraulic pressure and electricity to keep primary flight controls and a minimum instrument set alive. On the 767, deployment is automatic when both engines fail above a threshold airspeed.

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