control surface


  1. A moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw.
    Before flight its is vital to ensure all control surfaces are clear of obstruction and can move smoothly and freely.

The above text is a snippet from Wiktionary: control surface
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!