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45-50
50-55
*Approximate
power settings
to achieve a
1 kt/sec
deceleration
If ground contact is not a factor
At buffet or stick shaker:
• Apply maximum thrust
• Smoothly decrease pitch
attitude to approximately 5°
above the horizon
• Level wings
• Accelerate to maneuvering
speed for flap position
• Stop descent and return to
target altitude
• At altitudes above 20,000 feet,
pitch attitudes less than 5°
may be necessary to achieve
acceptable acceleration.
Target% N1*
Flaps Gear Bank
Maneuver complete
Initial Conditions Approach Recovery
Note pitch
attitude at
trim speed
Up Up
Up
Dn
20
30
0°
25°
0°
Maintain airplane in
trim until stick
shaker or buffet If ground contact is a factor
At buffet or stick shaker:
• Apply maximum thrust
• Smoothly adjust attitude as
necessary to avoid terrain
• Level wings
• Accelerate to maneuvering
speed for flap position
• Level off at target altitude.
/ 767
October 31, 2004
767 Flight Crew Training Manual
Maneuvers
Copyright © The Boeing Company. See title page for details.
FCT 767 (TM) 7.9
Command Speed
As the airplane is decelerated to the desired initial condition for the approach to
stall, set command speed to the maneuver speed for each selected flap setting. For
the approach to stall in the landing configuration, set command speed to VREF 30
+ 5 knots.
Initial Buffet-Stall Warning-Stall Buffet
Approach to stalls are entered with thrust set appropriate for an airspeed decrease
of 1 knot per second.
During the initial stages of a stall, local airflow separation results in initial buffet
giving natural warning of an approach to stall. A stall warning is considered to be
any warning readily identifiable by the pilot, either artificial (stick shaker) or
initial buffet. Recovery from an approach to stall is initiated at the earliest
recognizable stall warning, initial buffet or stick shaker.
Lateral and Directional Control
Lateral control is maintained with ailerons. Rudder control should not be used
because it causes yaw and the resultant roll is undesirable.
Effect of Flaps
Flaps are used to increase low speed performance capability. The leading edge
devices ensure that the inboard wing stalls prior to the outboard wing. This causes
the nose of the airplane to pitch down at the onset of the stall.
Effect of Speedbrakes
For any airspeed, the angle of attack is higher with speedbrakes up. This increases
initial buffet speed and stick shaker speed but has a lesser effect on actual stall
speed.
Entry
To save time, thrust levers may be closed to allow a more rapid deceleration.
Target thrust for the configuration should be set approaching selected speed.
Some thrust is used during entry to provide positive engine acceleration for the
recovery. The airplane is maintained in trim while decelerating. Level flight or a
slight rate of climb is desired.
Landing Gear
If the entry has been made with the landing gear extended, do not retract it until
after the recovery.
October 31, 2004
767 Flight Crew Training Manual
Maneuvers
Copyright © The Boeing Company. See title page for details.
7.10 FCT 767 (TM)
Flaps
Do not retract flaps during the recovery. Retracting the flaps from the landing
position, especially when near the ground, causes an altitude loss during the
recovery.
Recovery
Recover from approach to a stall with one of the following recommended recovery
techniques.
Ground Contact Not a Factor
At the first indication of stall (buffet or stick shaker) smoothly apply maximum
thrust, smoothly decrease the pitch attitude to approximately 5 degrees above the
horizon and level the wings. As the engines accelerate, counteract the nose up
pitch tendency with positive forward control column pressure and nose down trim.
(At altitudes above 20,000 feet, pitch attitudes of less than 5 degrees may be
necessary to achieve acceptable acceleration.)
Accelerate to maneuvering speed and stop the rate of descent. Correct back to the
target altitude.
Ground Contact a Factor
At the first indication of stall (buffet or stick-shaker) smoothly advance the thrust
levers to maximum thrust and adjust the pitch attitude as necessary to avoid the
ground. Simultaneously level the wings. Control pitch as smoothly as possible. As
the engines accelerate, the airplane nose pitches up. To assist in pitch control, add
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767机组训练手册Flight Crew Training Manual (FCTM)767(105)
