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      | WINGS 
            AND CONTROL SURFACES - FLAPS |   
	  |  | The control surface that lowers from 
            the back (or trailing edge) of the wing is the flap. Flaps are used 
            in the takeoff and landing phases of flight to allow the aircraft 
            to fly safely at slower speeds by actually changing the curve (camber) 
            of the wing.
 
 When you are flying in a commercial aircraft during its approach 
            to landing, you often hear the pilot actuating the flap motors to 
            lower the flaps during the approach. Next time you fly, if you are 
            sitting near one of the wings, look out the window and watch the 
            flaps come down in increments during the approach. The pilot puts 
            the flaps down more and more as the aircraft slows during its approach.
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