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greater than those typically required for high speed runway turnoffs.
Note: High taxi speed combined with heavy gross weight and a long taxi distance
can result in tire sidewall overheating.
Under normal conditions, differential braking and braking while turning should be
avoided. Allow for decreased braking effectiveness on slippery surfaces.
Avoid following other airplanes too closely. Jet blast is a major cause of foreign
object damage.
During taxi, the momentary use of idle reverse thrust may be needed on slippery
surfaces for airplane control. The use of reverse thrust above reverse idle is not
recommended due to the possibility of foreign object damage and engine surge.
Consider having the airplane towed rather than relying on the extended use of
reverse thrust for airplane control.
Note: If reverse thrust is selected after V speeds have been entered, the V speeds
are removed from the airspeed display, and full TO thrust becomes the
thrust limit for takeoff.
Carbon Brake Life
Brake wear is primarily dependent upon the number of brake applications. For
example, one firm brake application causes less wear than several light
applications. Continuous light applications of the brakes to keep the airplane from
accelerating over a long period of time (riding the brakes) to maintain a constant
taxi speed produces more wear than proper brake application.
October 31, 2006
777/787 Flight Crew Training Manual
Ground Operations
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 2.7
During taxi, proper braking should involve a steady application of the brakes to
decelerate the airplane. Release the brakes as lower speed is achieved. After the
airplane accelerates, repeat the braking sequence.
Antiskid Inoperative
With antiskid inoperative, tire damage or blowouts can occur if moderate to heavy
braking is used. With this condition, it is recommended that taxi speed be adjusted
to allow for very light braking.
Tiller/Rudder Pedal Steering
The captain's and first officer's positions are equipped with a tiller steering control.
The tiller is used to turn the nose wheels through the full range of travel at low taxi
speeds. Maintain positive pressure on the tiller at all times during a turn to prevent
the nose wheels from abruptly returning to center. Rudder pedal steering turns the
nose wheels through a limited range of travel. Straight ahead steering and large
radius turns may be accomplished with rudder pedal steering.
787-8
Note: The left and right tillers are not interconnected. To insure airplane control
is not compromised during taxi, only one pilot should make tiller control
inputs at a time. Do not transfer tiller control when the airplane is in a turn.
If nose wheel “scrubbing” occurs while turning, reduce steering angle and/or taxi
speed. Avoid stopping the airplane in a turn as excessive thrust is required to start
taxiing again.
Differential thrust may be required at high weights during tight turns. This should
only be used as required to maintain the desired speed in the turn. After
completing a turn, center the nose wheels and allow the airplane to roll straight
ahead. This relieves stresses in the main and nose gear structure prior to stopping.
Main Gear Aft Axle Steering
777-200 - 777-300ER
Main gear aft axle steering provides shorter turn radius, reduces thrust
requirements for tight turns, and minimizes tire scrubbing. It is automatically
activated when the nose gear steering angle exceeds 13°.
Turning Radius and Gear Tracking
During all turning maneuvers, crews should be aware of their position relative to
the nose and main landing gear. The pilot seat position is forward of the nose
wheels and main gear as indicated in the tables in this chapter.
October 31, 2006
777/787 Flight Crew Training Manual
Ground Operations
Copyright © The Boeing Company. See title page for details.
2.8 FCT 777/787 Preliminary (TM)
As the following diagram illustrates, while the airplane is turning, the main gear
tracks inside the nose gear. The smaller the radius of the turn, the greater the
distance that the main gear tracks inside the nose gear and the greater the need to
steer the nose gear outside of the taxi path (oversteer).
Visual Cues and Techniques for Turning while Taxiing
The following visual cues assume the pilot’s seat is adjusted for proper eye
position. The following techniques also assume a typical taxiway width. Since
there are many combinations of turn angles, taxiway widths, fillet sizes and
taxiway surface conditions, pilot judgment must dictate the point of turn initiation
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787机组训练手册Flight Crew Training Manual 787(27)
