how do u taxi while using the rudder pedals but not have the rudder turn.
The Rudder and the nose wheel are interconnected on the ground, push left pedal to go left and right pedal to go right. The Rudder will move, there's no way or reason to prevent it's movement.
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Because Large aircraft have a small steering lever or wheel called a tiller on the Captains side. The pedals are used to steer on straight sections(they have limited authority) but the tiller is used to make large turns. The tiller is only connected to the nose wheel.