The trim tab allows its operator (in this case, my flight instructor) to reduce the manual inputs needed to maintain position. Changing the setting of the trim tab adjusts the neutral position of a control surface, such as the elevator or rudder. The ability to adjust the trim and relieve control pressures must be a stress reliever for the ever-patient instructor.
I understood he was adjusting to keep us level, but it bugged me-and it contributed to my lack of understanding of the trim tab.įactors such as wind, power settings, airspeed, and attitude affect the control inputs required by a pilot and can lead to herky-jerky overcompensations or constant, tiring pressure on the controls. Rolling it up changed the pitch to more of a nose-down position and rolling it down did the reverse. It was located in the console between our seats, a black wheel with bumps. My flight instructor was always fiddling with the trim wheel. It increases the control feel and helps prevent overcontrolling the aircraft’s pitch. Instead of adjusting the trailing edge of the elevator, some trim systems move the leading edge of the stabilizer up and down.Īntiservo tabs move in the same direction-when the elevator or stabilator moves up, the antiservo tab moves in the same direction. Move the trim tab up, and it deflects the elevator down, and vice versa. Many trim tabs in small aircraft move the elevator in the opposite direction.
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