trickijedi
Posts: 3201
Joined: Sun May 13, 2001 4:35 pm

How Does An Aircraft Turn When Taxiing?

Wed May 15, 2002 7:44 am

How does a commercial aircraft turn during the taxi phase? Is the yoke used much like a car... or are the rudder pedals used?
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ALSF 2
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Joined: Mon Apr 01, 2002 12:28 pm

RE: How Does An Aircraft Turn When Taxiing?

Wed May 15, 2002 7:48 am

Most larger aircraft use a tiller (a knob or handle, usually on the captain side only that rotates the nose wheel).

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777236ER
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RE: How Does An Aircraft Turn When Taxiing?

Wed May 15, 2002 8:38 am

Rudder pedals usually give a degree of nose wheel authority.
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FlightTest
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RE: How Does An Aircraft Turn When Taxiing?

Wed May 15, 2002 9:18 am

There are a couple of ways, both mentioned above. But along with the tiller wheel or rudder pedal steering (the rudder pedals are connected to the nose steering) one can use differential braking and engine power. Example...want to make a tight left turn??? Go hard left on the steering along with the left brake then apply power on the right hand engine (if you're in a multi engine). This works best when the engines are far apart along with the landing gear having a wide stance.
 
OPNLguy
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RE: How Does An Aircraft Turn When Taxiing?

Wed May 15, 2002 9:51 am

Over on the left lower sidewall of the cockpit, about where the captain's left knee would be, is the nosewheel tiller...


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flyingbronco05
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RE: How Does An Aircraft Turn When Taxiing?

Wed May 15, 2002 11:05 am

In the C172's, I use the brakes that are on the rudder pedals. For twin props, you also use the brakes but you can assist in turning with different engine speeds.
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SSTjumbo
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RE: How Does An Aircraft Turn When Taxiing?

Wed May 15, 2002 12:25 pm

Can somebody tell me how the tiller is hooked up mechanically to the nosewheel? Thanx
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FlightTest
Posts: 35
Joined: Wed Apr 24, 2002 4:01 am

RE: How Does An Aircraft Turn When Taxiing?

Wed May 15, 2002 12:29 pm

The only one that I have experience on is the Hawker 800XP bizjets.

The tiller is connected via cables to a hydraulic valve on the nose landing gear that controls the actuator for the steering.
 
trickijedi
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RE: How Does An Aircraft Turn When Taxiing?

Thu May 16, 2002 12:37 pm

Thanks for the responses so far...

A couple of more questions:
1) So the yoke is not used at all in the taxi process, is that correct?

2) I'm still a little confused about the function of the rudder pedals during taxiing... are they exclusively used for braking?

Its better to be on the ground wishing you were in the air than be in the air wishing you were on the ground. Fly safe!
 
Beefmoney
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RE: How Does An Aircraft Turn When Taxiing?

Thu May 16, 2002 2:32 pm

On the Cessna 172, the rudder pedals have toe brakes on the top, and if you press on the bottom you are just using the rudder, and no brakes. Just using rudder will give you a few degrees deflection on the nose wheel, because the rudder and nose wheel are inter-connected. If you push on the top as well, the aircraft will turn much tighter, because you are locking up, or nearly so, the wheels on one side of the plane. And no, the yoke is not used at all during taxi, except to help balance the aircraft against the wind.
 
flyingbronco05
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Joined: Fri May 10, 2002 11:43 am

RE: How Does An Aircraft Turn When Taxiing?

Fri May 17, 2002 1:28 am

you are correct that the yoke plays no role in TURNING. However, you may need to deflect some aileron into the wind to keep a 172 from flipping over on run up.
Never Trust Your Fuel Gauge
 
bio15
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RE: How Does An Aircraft Turn When Taxiing?

Fri May 17, 2002 8:23 am

Keeping it simple, the yoke just controls the ailerons and elevator. On airliners, the rudder pedals will be used for brakes (when push with your toes to bring them down) and will also control the rudder deflection along with a little nosewheel steering (when pushing with your heels to displace the pedals back and forth). When taxiing, you will generally need more nosewheel steering than the 7° (not sure, but it's not much) provided by the pedals, so you will use the tiller which has been mentioned. On takeoff, at higher speeds, steering to keep the nosewheel centered can be achieved just with the pedals.
-bio

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