When does control of a jetliner switch from till wheel to control surfaces during takeoff?

Answer 1

If you mean the tiller wheel, this is only used during taxi, and not every aircraft has one. During the takeoff roll (and for many airplanes, especially small ones) the brakes are used instead until the aircraft has enough speed for the control surfaces to take over, and that varies according to the aircraft.

Answer 2

Usually once the aircraft is lined up on the runway. A typical jetliner has 5 to 7 degrees of nose wheel steering with the rudder pedals and up to 90 degrees with the tiller. Brakes are not used to control direction at any time during the takeoff because of reduced takeoff performance and possible brake overheating/fire.

Some older aircraft like the Convair 580 only have the tiller steering for the nose wheel; the rudder pedals are not connected to the steering at all. I can't remember what speed the switch over is but well before rotation, the captain moves his hand off the tiller to the control wheel.

Answer 3

Hmm lot of answers, but only one answer to your question. I can tell you that the plane I operate now, this happens at 100 knots. It is not a mechanical disconnect though. The pilot just takes his hand off the tiller and puts it on the yoke. The 707 has no connection between the rudder pedals and the Nose wheel steering. In case of an rejected takeoff before decision speed, the pilot in the left seat must move his hand back to the tiller after the abort procedures are completed.

Answer 4

Are you talking about ground steering? If so ground steering and the rudder are tied together on certain aircart. The reason for this is when an aircraft reaches a certain speed ground steering is no longer a viable option and the rudder actually steers the aircrart.

Now as far was when? well its different for all aircraft but it is related to aircraft speed. Most switch over before 100kt's. Even during taxiing though some aircraft can be steered with rudder pedals alone such as the b757...sorry I can't be more specific but you need to name the aircraft fleet type.

Answer 5

The short answer is "yes"

Even before the aircraft is moving, the pilot typically begins to add the required aerodynamic inputs. They will be ineffectual at first, but as the aircraft gains speed, they gain control authority and at some point as the aircraft is accelerating they gain more authority than the steerable nosewheel.

Next time you're on an airplane look out at the wings, you'll notice that even before you take off, the pilot (the good ones anyway) apply proper crosswind correction before its necessary

Answer 6

You probably mean the nosewheel steering, works upto 70kts (depending on A/C). Then when there is sufficient airflow over the control surfaces to influence the aircraft the pilot starts to use the controls. The reverse also happens on the landing when the speed reduces. That clear enough?

Answer 7

When the jetliner lines up with the runway, about to start the takeoff run.