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What is a trim tab?
A trim tab is a small flap located on major control surfaces like the elevators. Trim tabs are used to adjust the pitch of the aircraft. Most aircrafts are well balanced, however it is difficult to achieve perfect balance. When pilots get to a cruising altitude they adjust the trim so that they can reduce the amount of pressure they need on the flight stick to hold the aircraft level. The trim tab will make small adjustments to the lift force on each surface, making the aircraft more balanced.