Antiservo Tabs
Antiservo tabs work in the same manner as balance tabs except, instead of moving in the opposite direction, they move in the same direction as the trailing edge of the stabilator.
In addition to decreasing the sensitivity of the stabilator, an antiservo tab also functions as a trim device to relieve control pressure and maintain the stabilator in the desired position.
The fixed end of the linkage is on the opposite side of the surface from the horn on the tab;
when the trailing edge of the stabilator moves up, the linkage forces the trailing edge of the tab up.
When the stabilator moves down, the tab also moves down.
Conversely, trim tabs on elevators move opposite of the control surface.
Ground Adjustable Tabs
Many small aircraft have a nonmovable metal trim tab on the rudder.
This tab is bent in one direction or the other while on the ground to apply a trim force to the rudder.
The correct displacement is determined by trial and error.
Usually, small adjustments are necessary until the aircraft no longer skids left or right during normal cruising flight.
Adjustable Stabilizer
Rather than using a movable tab on the trailing edge of the elevator, some aircraft have an adjustable stabilizer.
With this arrangement, linkages pivot the horizontal stabilizer about its rear spar.
This is accomplished by the use of a jackscrew mounted on the leading edge of the stabilator.
On small aircraft, the jackscrew is cable operated with a trim wheel or crank.
On larger aircraft, it is motor driven.
The trimming effect and flight deck indications for an adjustable stabilizer are similar to those of a trim tab.
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