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deflection.
During taxiing, the pilot’s heels should be on the floor, sliding the feet up on the
rudder pedals only when required to apply brakes to slow the taxi speed, or when
maneuvering in close quarters on the parking ramp.
Thrust Use
Thrust use during ground operation demands sound judgment and technique. Even
at relatively low thrust the air blast effects from the large, high bypass engines can
be destructive and cause injury. Airplane response to thrust lever movement is
slow, particularly at high gross weights. Engine noise level in the flight deck is low
and not indicative of thrust output. Idle thrust is adequate for taxiing under most
conditions. A slightly higher thrust setting is required to begin taxiing. Allow time
for airplane response before increasing thrust further.
Excess thrust while taxiing may cause foreign objects to deflect into the lower aft
fuselage, stabilizer, or elevators, especially when the engines are over an
unimproved surface. Runups and taxi operations should only be conducted over
well maintained paved surfaces and runways.
Taxi Speed and Braking
To begin taxi, release brakes, smoothly increase thrust to minimum required for
the airplane to roll forward, then reduce thrust to idle. A turn should not be started
until sufficient forward speed has been attained to carry the airplane through the
turn at idle thrust.
The airplane may appear to be moving slower than it actually is due to the flight
deck height above the ground. Consequently, the tendency may be to taxi faster
than desired. This is especially true during runway turnoff after landing. The
ground speed display on the flight instruments may be used to determine actual
taxi speed. The appropriate taxi speed depends on turn radius and surface
condition.
October 31, 2004
767 Flight Crew Training Manual
Ground Operations
Copyright © The Boeing Company. See title page for details.
FCT 767 (TM) 2.5
Taxi speed should be closely monitored during taxi out, particularly when the
active runway is some distance from the departure gate. Normal taxi speed is
approximately 20 knots, adjusted for conditions. On long straight taxi routes,
speeds up to 30 knots are acceptable, however at speeds greater than 20 knots use
caution when using the nose wheel steering tiller to avoid overcontrolling the nose
wheels. When approaching a turn, speed should be slowed to an appropriate speed
for conditions. On a dry surface, use approximately 10 knots for turn angles
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.
When the airplane is equipped with steel brakes, avoid prolonged brake
application to control taxi speed as this causes high brake temperatures and
increased wear of brakes. If taxi speed is too high, reduce speed with a steady
brake application and then release the brakes to allow them to cool. Braking to
approximately 10 knots and subsequent release of the brakes results in less heat
build-up in the tires and brakes than when the brakes are constantly applied.
Under normal conditions, differential braking and braking while turning should be
avoided. Allow for decreased braking effectiveness on slippery surfaces.
Avoid following other aircraft too closely. Jet blast is a major cause of foreign
object damage.
During taxi, the use of reverse thrust above reverse idle is not recommended due
to the possibility of foreign object damage and engine surge. Momentary use of
idle reverse thrust may be necessary on slippery surfaces for airplane control while
taxiing. Consider having the airplane towed rather than relying on extended use of
reverse thrust for airplane control.
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.
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.
October 31, 2004
767 Flight Crew Training Manual
　
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