787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Instruments, Displays -
Electronic Flight Bag - Controls
and Displays
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 10.70.25
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FCOM2 >> 9: Flight Controls >> 9-20: System Description >> Secondary and Direct
Pitch Control
In secondary and direct modes, the elevator variable feel system provides feel
force levels based on flap position instead of a continuous variation with
airspeed. With the flaps up, the feel forces provide maneuver force levels that
discourage over control in the pitch axis at high speeds. With the flaps not up,
the feel forces decrease to provide force levels appropriate for approach and
In the secondary and direct modes there is no trim reference speed. Both the
primary and alternate pitch trim switches move the stabilizer directly.
landing.
Stabilizer Electric Power and Non–Normal Operation
Stabilizer position commands are processed through two independent channels
within the flight control system. The commands come from the primary or
alternate pitch trim switches and move the stabilizer using an electric control
unit powered by the L2 and R2 AC buses.
Stabilizer Shutdown
If uncommanded stabilizer motion is sensed, the stabilizer channel that caused
the motion is automatically shut down. If a channel is inoperative due to auto-
matic shutdown or failure, the EICAS advisory message STABILIZER L2 or
STABILIZER R2 is displayed. The stabilizer remains operative through the
remaining channel. If the affected channel can not be isolated, both channels
If both stabilizer channels automatically shut down or fail, the EICAS warning
message STABILIZER is displayed. This warning is also displayed if automatic
shutdown fails to stop the uncommanded motion.
are shut down.
The L2 and R2 stabilizer cutout switches, located on the aisle stand, control
electric power to the independent stabilizer channels. Placing both switches in
the CUTOUT position removes all power from the stabilizer and the EICAS
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June 16, 2008
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