Private Pilot License (PPL) Aircraft General Knowledge (AGK) Practice Test

Takeoff distance is determined by how far you must travel on the ground to reach the required liftoff airspeed. The wind affects your ground speed, not the airspeed you need to achieve. With a headwind, your ground speed is reduced, so you cover less ground while accelerating to liftoff speed, shortening the runway needed. If the wind switches to a tailwind of the same speed, your ground speed increases during the same acceleration, so you must travel farther on the ground to reach the same liftoff airspeed, increasing the required takeoff distance. This is why the correct answer is that takeoff distance increases.