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approaching stall, both with and without the autopilot. Recovery from a fully
developed stall is discussed later in this section.
Stall Protection Demonstration
Stall warning is considered to be a warning readily identifiable by the pilot, either
initial buffet or artificial (stick shaker). During initial stages of stall, local airflow
separation results in buffeting (initial buffet), giving natural warning of an
approach to stall. At cruise Mach numbers, stick shaker activation occurs just after
reaching initial buffet. Initiate recovery from an approach to stall at the earliest
recognizable stall warning, either initial buffet or stick shaker.
Begin the stall protection demonstration in level flight with flaps up at VREF
30+80 knots. Select a speed in the IAS/MACH window that is below the minimum
speed indication on the speed tape. Disconnect the autopilot and autothrottle and
retard the thrust levers to idle. As the speed decreases into the amber band, the PLI
appears on the PFD. When the speed decreases approximately half way through
the amber band, the AIRSPEED LOW caution message appears. The autothrottle
wakes up, automatically engages in the SPD mode and returns the airplane to
minimum maneuvering speed.
For the second part of the stall protection demonstration, select VREF 30 on the
CDU. Disconnect the autopilot, turn the autothrottle switches off and select a
speed in the IAS/MACH window that is below the minimum speed indication on
the speed tape. Maintain heading and altitude, and retard the thrust levers to idle.
As the airplane decelerates, continue trimming and select flaps 20 on schedule.
The pitch limit indicator appears on the PFD when the flaps are extended. The
airplane can be trimmed down to an airspeed approximately equal to the minimum
maneuver speed. Below this airspeed, nose up trim is inhibited. After the airspeed
decreases into the amber band, use only control column inputs to maintain level
flight. The stick shaker activates at minimum speed. If the airspeed reduces to
slightly less than minimum speed, increased control column force is required to
maintain level flight. Recovery from the approach to stall is conventional.
Advance the thrust levers full forward and adjust pitch to maintain altitude.
Lateral control is maintained with ailerons and spoilers. Rudder control should not
be used to maintain wings level. A rudder input causes yaw and the resultant roll
due to yaw is undesirable. Accelerate to VREF 30 + 80 knots while retracting
flaps.
October 31, 2006
777/787 Flight Crew Training Manual
Maneuvers
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 7.11
To demonstrate autopilot stall protection, ensure that the pitch mode is ALT, turn
the Autothrottle switches OFF and retard thrust levers to idle. As the airspeed
approaches the minimum speed an AUTOPILOT caution message appears, an
amber line is drawn through the selected pitch mode and the flight director pitch
bar is removed. At minimum speed the stick shaker activates. Shortly after the
stick shaker activates, the autopilot begins to descend from the selected altitude.
The autopilot maintains a descent at a speed that is slightly above the minimum
speed. To recover, return the speed to maneuvering speed by engaging the
autothrottle with a higher speed selected or manually advance the thrust levers.
Select a new pitch mode or disconnect the autopilot and manually fly the airplane
back to the starting altitude.
October 31, 2006
777/787 Flight Crew Training Manual
Maneuvers
Copyright © The Boeing Company. See title page for details.
7.12 FCT 777/787 Preliminary (TM)
Stick Shaker and Stall Speeds
The following figures depict stick shaker and stall speeds at various gross weights
and flap settings. This data is presented for training purposes only.
October 31, 2006
777/787 Flight Crew Training Manual
Maneuvers
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 7.13
Stick Shaker and Stall Speed
777-200
Airspeed (KCAS)
120
160
200
240
280
300 400 500 600 700
Gross Weight - 1000 lbs (Kgs)
(136.4) (181.1) (227.3) (272.7) (318.2)
Stick Shaker
Stall Speed
Maneuver Speed (VREF30+80)
Flaps Up
Gear Up
10,000 Ft
Idle Thrust
Forward CG
Airspeed (KCAS)
80
120
160
200
240
300 400 500 600 700
Gross Weight - 1000 lbs (Kgs)
(136.4) (181.1) (227.3) (272.7) (318.2)
Flaps 5
Gear Up
10,000 Ft
Idle Thrust
Forward CG
　
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