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An S-foil servo actuator
The S-foil servo actuator was mechanism located on the backs of T-65B X-wing starfighters. Its purpose was to deploy and withdraw the X-wing's S-foils, effectively readying the X-wing for flight and combat.[1]
Sources[]
Star Wars: Card Trader (Card: X-wing Starfighter - Blueprints) (First identified as S-foil servo actuator)
