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Main landing gear is important part in aircraft, its help the aircraft to takeoff ,landing, and taxing in the ground .This part subject to high stress at landing due to impact, there are two important force act on landing gear during touch, Normal force and a spin-up back force .Normal Force is a great force that act on landing gear and its generate due to Normal impact and its cause to bend landing gear to up , this force can be calculated form Newton second law, and the spin-up back force generated at touch when the tire not rotate causing the landing gear leg to bend to backward the value of this value can be assumed equals to 0.5 from the normal force. In this study this forces type are considered to make stress analysis of the landing gear for Cessna 152 during touchdown time, after that three model are considered to reduce value of stress on this landing gear by keeping the dimension and material as on original model and making positive curves on the landing gear leg, and shown that when making the positive curve this will reduce the value of the stress and deflection on the landing gear depending on the principle of bending moment in the beams.

Stress analysis on main landing gear for small aircraft