What are the nose wheel deflection angles when using pedals only, tiller only, and both together?

What are the nose wheel deflection angles when using pedals only, tiller only, and both together?

• A. 7.5°, 80.5°, 88°
• B. 5°, 75°, 85°
• C. 10°, 90°, 100°
• D. 0°, 0°, 0°

Answer: (A)

On the ground, nose wheel steering combines inputs from two controls: the tiller and the rudder pedals. The tiller is used for taxiing and provides a large nose wheel deflection, about eighty degrees, to allow tight turns at low speed. The rudder pedals contribute a much smaller amount when used on the ground, roughly seven and a half degrees, for fine steering or minor corrections. When both controls are used together, their effects add up, up to the mechanical limit of the nose wheel steering linkage. So with full input on both, you end up near the maximum steering angle, about eighty-eight degrees. The numbers reflect the typical relationship between the two controls and the system’s limit. Other choices either imply no steering, exceed the mechanical limit, or misstate the relative contributions of pedals and tiller.

On the ground, nose wheel steering combines inputs from two controls: the tiller and the rudder pedals. The tiller is used for taxiing and provides a large nose wheel deflection, about eighty degrees, to allow tight turns at low speed. The rudder pedals contribute a much smaller amount when used on the ground, roughly seven and a half degrees, for fine steering or minor corrections. When both controls are used together, their effects add up, up to the mechanical limit of the nose wheel steering linkage. So with full input on both, you end up near the maximum steering angle, about eighty-eight degrees. The numbers reflect the typical relationship between the two controls and the system’s limit. Other choices either imply no steering, exceed the mechanical limit, or misstate the relative contributions of pedals and tiller.