Embraer EMB145 Operation Manual page 2021

FLIGHT CONTROLS
AIRPLANE
OPERATIONS
MANUAL
ROLL TRIM SYSTEM
Roll trim is performed by relocating the aileron's neutral position. It is
provided through an electromechanical actuator linked to the artificial
feel unit and commanded through a switch on the control pedestal aft
panel. If the aileron trim switches are activated with the autopilot
engaged, the aileron neutral point is repositioned. When the autopilot
is disengaged, the ailerons move to the repositioned aileron neutral
point.
A continuous command of the roll trim switch is limited to 3 seconds,
even if the trim switch is pressed longer than 3 seconds. As a result,
when manually actuating the trim, it is necessary to release the switch
after a 3-second actuation, then actuate it again to continue the trim
command. This feature intends to minimize the effects of an
inadvertent trim command failure.
When using the roll trim switch, it is necessary to command both
segments simultaneously since, if just one segment is commanded,
the control unit will not provide any command for the actuator.
A quick-disconnect button installed on the control wheels allows, while
kept pressed, to disconnect the roll trim.
Page Code
4 01
2-13-15 JUNE 29, 2001