Which component changes roll?

Which component changes roll?

• A. Spoiler
• B. Aileron
• C. Flaps
• D. Wing

Answer: (B)

Roll is rotation around the aircraft’s front-to-back axis, and the primary device that changes it is the aileron. Ailerons are the movable surfaces on the trailing edges near the wingtips that deflect in opposite directions. When the control wheel is turned, one aileron goes up and the other goes down, reducing lift on one wing while increasing lift on the other. That lift difference tips the aircraft, causing a roll toward the wing with less lift. Flaps mainly increase lift for takeoff and landing and don’t control roll, while spoilers can aid roll by creating drag or reducing lift on a wing, but they’re not the primary means of rolling the aircraft. The wing itself doesn’t actively cause roll without these movable surfaces.

Roll is rotation around the aircraft’s front-to-back axis, and the primary device that changes it is the aileron. Ailerons are the movable surfaces on the trailing edges near the wingtips that deflect in opposite directions. When the control wheel is turned, one aileron goes up and the other goes down, reducing lift on one wing while increasing lift on the other. That lift difference tips the aircraft, causing a roll toward the wing with less lift. Flaps mainly increase lift for takeoff and landing and don’t control roll, while spoilers can aid roll by creating drag or reducing lift on a wing, but they’re not the primary means of rolling the aircraft. The wing itself doesn’t actively cause roll without these movable surfaces.