Which parameter is commonly adjusted via flap setting to influence landing distance?

• A. Fuel quantity
• B. Engine power
• C. Flap setting
• D. Radio altitude

Answer: (C)

Flaps change the wing’s lift and drag characteristics, which is why they’re used to influence landing distance. Deploying flaps increases the wing’s camber, allowing you to fly at a much lower approach and landing speed without stalling. A slower approach means you reach the runway with less kinetic energy to shed, so the distance required to decelerate and stop is reduced. The added drag from flaps also helps slow the aircraft during the approach, supporting that lower speed. After touchdown, the extra drag continues to aid deceleration with braking and reverse thrust.

Fuel quantity and engine power aren’t controlled by flap settings in a way that directly tunes landing distance, and radio altitude is a measurement, not a controllable parameter via flap settings.