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AP4ATCO - Aircraft Controls/Answer 2
From SKYbrary Wiki
Rudder effectiveness increases with aircraft speed. Thus, at slow speed, large rudder input may be required to achieve the desired results. Smaller rudder movement is required at higher speeds and, in many more sophisticated aircraft, rudder travel is automatically limited when the aircraft is flown above Manoeuvring Speed to prevent deflection angles that could potentially result in structural damage to the aircraft.