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I can answer on the F-16 :) The general system description tells us that the Leading Edge Flaps may be positioned from 2 degrees (1 inch) up to 25 degrees (12-1/2 inches) down. I assume it is similar on the F-22 and F-35, since the Leading Edge Flap subsystem provides high lift for takeoff and landing and optimizes performance in each flight phase.

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