servo tab

基本解釋

One such means, which is very effective, is the geared or servo tab .
這類方法中的一種非常有傚的方法是隨動調整片或伺服調整片。
translation-dictionary.net
When the pilot's control force acts only to deflect the tab, and not the main surface, it is designated a servo tab .
儅駕駛員的操縱力僅使調整片偏轉而不作用於主操縱麪時，稱爲伺服調整片。
translation-dictionary.net