In flight with flaps full, spoiler deflection is what angle?

In flight with flaps full, spoiler deflection is what angle?

• A. 12.5°
• B. 17.5°
• C. 22.5°
• D. 27.5°

Answer: (B)

When the wing flaps are in the full landing position, spoilers are set to a fixed deflection that provides the right amount of lift dump without upsetting handling. For this configuration, the spoiler deflection is 17.5 degrees. This angle balances the need to reduce lift (to ensure a stable, controllable approach and shorter landing distance) with the need to avoid excessive drag or disruptive pitch and control issues. Deflection angles smaller than that won’t shed enough lift, while larger angles would waste more energy and could affect maneuverability, so 17.5 degrees is the optimal setting for full-flap landing configuration.

When the wing flaps are in the full landing position, spoilers are set to a fixed deflection that provides the right amount of lift dump without upsetting handling. For this configuration, the spoiler deflection is 17.5 degrees. This angle balances the need to reduce lift (to ensure a stable, controllable approach and shorter landing distance) with the need to avoid excessive drag or disruptive pitch and control issues. Deflection angles smaller than that won’t shed enough lift, while larger angles would waste more energy and could affect maneuverability, so 17.5 degrees is the optimal setting for full-flap landing configuration.