737 Flight Crew Operations Manual
Flight Controls -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
9.20.4 D6-27370-866-EGP
Flight Spoilers
Four flight spoilers are located on the upper surface of each wing. Each hydraulic
system, A and B, is dedicated to a different set of spoiler pairs to provide isolation
and maintain symmetric operation in the event of hydraulic system failure.
Hydraulic pressure shutoff valves are controlled by the two flight SPOILER
switches.
Flight spoiler panels are used as speed brakes to increase drag and reduce lift, both
in flight and on the ground. The flight spoilers also supplement roll control in
response to control wheel commands. A spoiler mixer, connected to the aileron
cable-drive, controls the hydraulic power control units on each spoiler panel to
provide spoiler movement proportional to aileron movement.
The flight spoilers rise on the wing with up aileron and remain faired on the wing
with down aileron. When the control wheel is displaced more than approximately
10°, spoiler deflection is initiated.
September 28, 2006
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