Pilot control inputs cause the ailerons to deflect ___________________.

• A. In the same direction
• B. In opposite directions
• C. In first one, then the other direction
• D. Upwards only

Answer: (B)

Roll is produced by creating a difference in lift between the two wings. When you move the control column or stick for a roll, the ailerons deflect in opposite directions: one wing’s aileron goes up to reduce lift, while the other’s goes down to increase lift. This imbalance tilts the airplane and starts the roll toward the desired direction. If the ailerons moved in the same direction, both wings would lose or gain lift together, producing little or no rolling motion. And a motion described as upwards only isn’t how standard aileron authority works, since the two surfaces move in opposite directions to generate roll.