RoseFlyer From United States of America, joined Feb 2004, 8739 posts, RR: 52 Reply 4, posted (5 years 9 months 3 weeks 21 hours ago) and read 3452 times:
It can depend on the aircraft. The tiller and rudder pedals usually can both control the nose wheel steering. However they do it very differently. The tiller on a modern jet usually allows the nose gear to rotate to about 70 degrees. The rudder pedals only allow the nose gear to rotate about 7-9 degrees. Therefore, the tiller is used for all turns, but once on the runway and straight, the rudder pedals usually are sufficient. Now this can depend on the plane, but usually steering input on the runway should be done with the pedals. The tiller can always be used as a back up, but the rudder pedals cannot back up the tiller.
If you have never designed an airplane part before, let the real designers do the work!
WILCO737 From Greenland, joined Jun 2004, 8473 posts, RR: 78 Reply 5, posted (5 years 9 months 3 weeks 17 hours ago) and read 3423 times:
AIRLINERS.NET CREW HEAD MODERATOR
As I just posted in the BA RTO thread:
the tiller is used for line up, after that we use the rudder pedals for steering. With the pedals you steer the nose wheel as well, you not only use the rudder. The nose gear turns 7° (IIRC) to the left or right using ONLY the pedals. When airspeed is high enough (80knots) the rudder is affected as well. And those 2 are more than enough to keep the aircraft on the runway during take off run and as well during engine failure during RTO or after V1 to lift off and climb out!
Well, at least it works for 737s and MD11s I am flying... (and not in FS, in real and I always stayed on the runway just using the rudder pedals)
P.S.: and in 2 hours I will be sitting in my MD11F again, and ONLY using rudder pedals for the take off run...
PhilSquares From , joined Dec 1969, posts, RR: Reply 6, posted (5 years 9 months 3 weeks 17 hours ago) and read 3412 times:
Generally speaking in commercial aircraft, such as the 747, A320, 777 it's a big NO NO to use the tiller at all during the takeoff run. There is sufficient nosewheel authority through the pedals to control the aircraft prior to 80 knots or so. Beyond that speed the rudder is effective and you don't even think about touching the tiller!
CosmicCruiser From United States of America, joined Feb 2005, 2211 posts, RR: 16 Reply 9, posted (5 years 9 months 3 weeks 9 hours ago) and read 3324 times:
Quoting HAWK21M (Reply 7): If the Rudder is Ineffective.The Tiller is used until the Aircraft Speed Increases on the T/O roll.
Quoting HAWK21M (Reply 8): If the Rudder is Ineffective due slow speed.The Tiller is used until the Aircraft Speed Increases on the T/O roll.
As PhilSquares said..It's a big NO NO (at least in the jets I've flown both small and large) to use the tiller on the t/o roll or ldg roll for that matter. The rudder pedals have some nose wheel steering as well as rudder control. I've never NEVER seen a t/o that required use of tiller up to and including max allowable x-winds.
Quoting Fr8Mech (Reply 3): Some aircraft allow the rudder pedal steering to be deferred, thus tiller would be used on the runway
hey FR8mech can you tell me a jet that can do this? just curious.
Jetlagged From United Kingdom, joined Jan 2005, 2452 posts, RR: 17 Reply 16, posted (5 years 9 months 3 weeks 3 hours ago) and read 3236 times:
The tiller does not move the rudder. The pedals are geared to the tiller so that pedal movement moves the tiller, and thus the nosewheel. On Airbus aircraft it's done by a computer, not mechanical linkage.
The glass isn't half empty, or half full, it's twice as big as it needs to be.
CosmicCruiser From United States of America, joined Feb 2005, 2211 posts, RR: 16 Reply 17, posted (5 years 9 months 3 weeks ago) and read 3213 times:
Quoting HAWK21M (Reply 11): What would you do if you are not aligned straight & the rudder is ineffective.Would you not use the tiller.
I've never been off more than a few degrees and really so what. When you add t/o power you push on the appropriate rudder and t/o.
Quoting Fr8Mech (Reply 13): ...Rudder Pedal Nose Wheel Steering. Category C. 1 installed, 0 required. Pilot in the left seat must make take-offs and landings and no other system is affected.
Yes, you are correct...In my 9 yrs in the 727 I never saw it. Also I just referenced our 727 MEL and there is a BIG hit on x-wind and clutter for for dispatch w/o rudder steering. It's not a player. Thanks Fr8Mech for your reference.
Sanjet From Canada, joined Mar 2005, 180 posts, RR: 0 Reply 18, posted (5 years 9 months 3 weeks ago) and read 3212 times:
On the twin otter (DHC-6), we will use the tiller to stay aligned with the runway on take off / landing during high crosswind (30-40 kts) as rudder pedals have no direct control on nosewheel at low speeds. Ofcourse, above a certain airspeed, the rudder will be effective enough at which point the tiller is no longer used.
Bellerophon From United Kingdom, joined May 2002, 574 posts, RR: 60 Reply 21, posted (5 years 9 months 2 weeks 5 days 23 hours ago) and read 3060 times:
...As PhilSquares said..It's a big NO NO (at least in the jets I've flown both small and large) to use the tiller on the t/o roll or ldg roll for that matter...
I would agree, where rudder pedal nose wheel steering was fitted, but not all large aircraft were delivered with it fitted, necessitating the use of the tiller on the initial take-off roll, sometimes up to 80 kts.
...I've never NEVER seen a t/o that required use of tiller up to and including max allowable x-winds...
None of BA's B747-100 or B747-200 aircraft ever had rudder pedal nose wheel steering fitted, so all of those take-offs, over twenty years or so, required the use of the tiller, to some degree, in the early part of the take-off roll!
Why they didn't have it fitted, I do not know, because it is a useful feature.
Boeingfixer From Canada, joined Jul 2005, 490 posts, RR: 0 Reply 23, posted (5 years 9 months 2 weeks 5 days 17 hours ago) and read 3004 times:
Quoting HAWK21M (Reply 22): Quoting CosmicCruiser (Reply 20):
I can't imagine why that would happen. If you can't taxi onto the runway and line up within a few degrees you really screwed up TAXI 101
I agree with that coment.
Quoting HAWK21M (Reply 22): We have to cater to the worst senario possible.Thats how Flight safety works.right Smile
Our 727 MEL States that the Rudder Pedal Nose Wheel Steering can be INOP for 10 days. It stresses caution when using the tiller duriing the takeoff roll as over controlling can easily happen.
BTW, Flight Safety is there to do things right the first time... not to salvage a poor take-off line-up or other scenario like that. Taking Flight Safety into account, one would re-allign for takeoff instead.