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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The elevator trim tab was found attached, and cable continuity was established
  from the trim tab to the middle of the cabin floor.
The trim tab controller shall be located at the operator's station.
Maintenance personnel investigated and found a bolt and bushing missing from
  the right elevator trim tab horn.
The horizontal tail plane has a fixed stabilizer with an elevator and trim tab.
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