trim-tab

trim tab

noun Aeronautics.
an independently controlled tab set in the trailing edge of a control surface, as an elevator, aileron, or rudder, to hold it in a position suitable for stabilizing the aircraft in a flight attitude.
Also, trimming tab.
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World English Dictionary
trim tab
 
n
a small control surface attached to the trailing edge of a main control surface to enable the pilot to trim an aircraft

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