787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Controls -
System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 9.20.19
The spoilers automatically retract and the speedbrake lever is driven forward to
the DOWN position, when any of the following conditions occur:
• on the ground, when either thrust lever is moved to the takeoff range, or
• on the ground, if there is a transition to in the air, or
• in the air, when either thrust lever is beyond 90% full travel
Automatic speedbrakes are only available in the Normal mode.
Autodrag
The autodrag function operates by extending the ailerons and the two most
outboard spoilers, while maintaining airspeed, to assist in glideslope/glidepath
capture when the airplane is above the vertical path. Autodrag functions only in
approach configuration; flaps 25 or 30 and the thrust levers are at idle. Spoiler and
aileron movement is shown on the flight control synoptic.The autodrag surface
deflection is gradually removed below 500 feet AGL so flare and touchdown are
not affected. The function is active during automatic or manual approaches.
Autodrag is only available in the Normal mode.
Flaps and Slats
The flaps and slats are high lift devices that increase wing lift and decrease stall
speed during takeoff, approach, and landing.
The airplane has an inboard and an outboard flap on the trailing edge of each wing,
and one inboard and five outboard slats on the leading edge. A two-position
Krueger flap provides a seal between the inboard slat and the engine nacelle on
each wing.
In the flaps 1 position, only the slats move. Flaps 5, 15, and 20 are takeoff flap
positions. Flaps 25 and 30 are landing flaps positions. Flaps 20 is used for some
non–normal landing conditions.
Flap and Slat Sequencing
When the flap lever is in the UP detent, all flaps and slats are commanded to the
retracted position. Moving the flap lever aft allows selection of flap detent
positions 1, 5, 15, 20, 25 and 30. The flaps and slats sequence so that the slats
extend first and retract last.
Starting from flaps UP, selection of flaps 1 commands the slats to move to the
middle position. The flaps remain retracted.
Selection of the flaps 5, 15, and 20 positions commands the flaps to move to the
position selected. The slats remain in the middle position.
Selection of flaps 25 commands the slats to move to the fully extended position.
The flaps do not move.
February 15, 2010
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