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Old 12th Mar 2019, 18:28
  #765 (permalink)  
Join Date: Jul 2005
Location: btw SAMAR and TOSPA
Posts: 565
Originally Posted by DaveReidUK View Post
You could make the same argument for flaps being classed as primary flight controls, but they aren't either. A stabilator is, though.

Flaps and slats are not controls. Stab trim is an indirect control that is not driven by the yoke (direct control) but by a wheel. Its aerodynamic effect is the same though differently scaled.
Certification of flaps and slats is along the same principles when it comes to an automated aircraft system retracting or driving them.
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