Spoilers can be used by some aircraft for what additional purpose?

• A. Only for speed control
• B. Not used in flight
• C. Primary roll control surface
• D. Used for roll control by some aircraft

Answer: (D)

Spoilers are panels on the wing that disrupt lift when deployed. Their common role is as speed brakes, helping to slow the aircraft and increase descent rate. In some aircraft, these same panels can be used differentially on each wing to create a rolling moment—this is spoileron behavior. By raising spoilers more on one wing than the other, that wing loses more lift, causing the airplane to roll toward the wing with the greater spoiler deployment. This provides roll control without relying solely on conventional ailerons, or can supplement them in certain flight regimes. So the additional purpose is roll control by some aircraft through spoilerons.