Spoileron Operation - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual
When spoilers are extended or retracted in flight, depending on the
Mach number, the configuration trim system automatically applies the
appropriate amount of pitch trim to compensate for the pitching
moment caused by spoiler repositioning.

SPOILERON OPERATION

Spoilerons operate automatically on the ground and in flight to
augment the ailerons whenever either control wheel is turned more
than 5°. Rotation of either control wheel provides a roll input to the
spoileron computer via dual RVDTs inside of the pilot's control wheel.
The appropriate spoiler, left or right, extends to the commanded angle
for the current conditions (Mach number, airspeed, AP engage and flap
setting) while the other spoiler is commanded stowed. When in the
mixed spoiler and spoileron mode, the spoiler command derived from
the spoiler lever and spoileron command derived from the control
wheel are added to form a composite position command for each
spoiler panel. The spoiler command provides a bias position command
common to both panels while the control wheel RVDTs generate a
differential command. The control wheel inputs command the angular
displacement that exists between the two spoilers regardless of the
amount of spoilers command. Spoileron commands have priority over
spoiler commands.
If the spoilers are extended, and the control wheel is turned right, the
computer mix logic retracts the left spoiler first to give differential nec-
essary for the roll commanded. If that is not enough differential for the
roll commanded, the computer then extends the right spoiler as
required.
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PM-132A