The process of takeoff and landing is a crucial factor in the phase of flight, other than because it is on the critical height but also the critical speed. At the time of the landing process required a low speed (no stall), as well as providing a high braking effect is obtained for a smooth landing and sliding distance is relatively short. At that result, in the process of landing a maximum flap deflection is used to produce CLmax and drag the highest. At the time the plane accelerate speeds

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... takeoff, immediately attempted to get the low takeoff speed (no stall), as well as provide a small braking effect to immediately achieved a high rate of speed. Thus required a small flap deflection of flaps on takeoff position.