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Ground Steering Mechanism On Commercial Aircrafts

Mon Oct 01, 2001 6:51 pm

Who knows how ground steering is performed on large commercial airplanes ? Is the nose wheel connected to the rudder pedals or, like in small airplanes, the steering performed by applying an asymmetrical breaks to the main landing gear ? And, whether the rudder panel is also moved when the airplane is taxiing ?
 
Guest

RE: Ground Steering Mechanism On Commercial Aircrafts

Mon Oct 01, 2001 9:02 pm

steering on ground is performed by a short wheel closed to the sidestick for aibus. (2 wheels ,1 for 1st off. and 1 for captain)
when you turn this handwheel, the signal go to the Brake and Steering Control Unit (BSCU) and give information to the steering servovalve which apply hydraulic on the 2 steering actuator.
with the handwheel, you can turn the nose wheels at 78° in either direction (handwheel is available when aircraft speed in under 100kts)

you can also use rudder pedale for the steering but the steering angle is 2 to 6° , depend of the aircraft speed and if you use A/P.
 
Guest

RE: Ground Steering Mechanism On Commercial Aircrafts

Mon Oct 01, 2001 10:13 pm

As with Laurent, this wheel is know as the Steering Tiller. It's basically a steering wheel for the nose gear.

 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Ground Steering Mechanism On Commercial Aircrafts

Wed Oct 03, 2001 3:07 am

Boeing aircraft use cabling to control their steering system.
Aircraft such as the B747 and B777 incorporate Body gear (B747) and Main gear (B777) steering. The Main/Body gear steering is dependent upon transducers to realy the position of the nose gear. At a certain degree...(I think apst 70 deg), the main gear turns to lessen the wear on tires and gives a better truning radius.
 
Guest

RE: Ground Steering Mechanism On Commercial Aircrafts

Sat Oct 06, 2001 6:25 pm

On a C-130 there is a small steering wheel to the left of the control yoke on the pilot's side.
 
Guest

RE: Ground Steering Mechanism On Commercial Aircrafts

Thu Oct 11, 2001 12:29 am

Is there a Steering Tiller on Boeings too, or the ground control performed using the pedals on these airplaines ?
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: Ground Steering Mechanism On Commercial Aircrafts

Thu Oct 11, 2001 2:11 am

Both. Boeings employ a tiller or wheel ( depending on the model ) for steering but the rudder inputs provide a finer ratio input ( 7 degrees max ) for steering at high ground speeds.
 
Mr Spaceman
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

RE: Ground Steering Mechanism On Commercial Aircrafts

Thu Oct 11, 2001 3:30 am

Hi guys.

> Cdfmxteck, you stated "Boeing aircraft use cabling to control their steering system". Can you please explain how these cables are attached to the hydraulic system used for the nosegear steering of a Boeing 747.

In the photo below of a 747's nosegear, you can see the hydraulic steering actuators on the aft side of the strut, near the ramp workers head.

Are there cables that run from the cockpit's tiller wheel and rudder pedals down to a hydraulic pump for the nosegear steering? If so...do you know the route?

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