Re: Ground handling

Date:         22 Feb 99 03:30:46 
From:         boeing707@bellsouth.net (boeing707)
References:   1
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In regards to your question, here are some answers about gound steering:

1. In ground steering, the nose gear automatically goes to neutral
position (in relation to the centerline to the airplane) when the tiller
is released. The return can be quite pronouced such as in the case of
the 707/727/737 in that if the tiller is released during a 30 or 40
degree turn of the nosegear, the airplane will snap back to a straight
taxi so quick somebody standing can get knocked down to the floor.
(thats one of the reasons we tell you to remain seated until we stop at
the gate!) I dont know about Douglas or Airbus equipment but I would
assume they are very much the same.

2. on rollout, rudder and asymmetrical braking AND engine thrust is used
for directional control as needed. there is to my knowledge no set rules
for what you use and how much; this is used at the discretion of the PF
(pilot flying). in some cases, you can also use asymmectrical REVERSE
engine thrust, and i have seen it done in a few instances, but this is
rare.

3. the physical arrangement of rudder pedals/brakes ('toe brakes') is
this: the rudder is controlled by pushing either rudder pedal in the
desired direction. the brakes are actuated by pushing the tops of the
rudder pedals with your toes (hence the name toe brakes). they can be
actuated by pushing the tops of either pedal as desired or both at the
same for stopping.

4. sorry for going out of order, but i believe Boeing recommends not
attempting to steer the airplane (at least in the case of the 737, i
dont know about other models) over 60 knots IAS. I am told that some
airplanes 'lock out' nosewheel steering over a certain speed.  Hope this
helps.

Ken Smith
USAirways - FLL
email Boeing707@bellsouth.net