The forces exerted on the airframe while taking off are different from the forces while landing.
The landing gear for instance really only experience the weight of the plane passively while taking off. When landing however there are additional dynamic downward forces from the landing itself, so the weight of the plane must be lighter to accomodate that additional landing force.
The forces exerted on the airframe while taking off are different from the forces while landing.
The landing gear for instance really only experience the weight of the plane passively while taking off. When landing however there are additional dynamic downward forces from the landing itself, so the weight of the plane must be lighter to accomodate that additional landing force.