Landing gear is one of the most important part of the aircraft as it takes the entire weight of the aircraft during landing. The up-lock system is an integral part of this landing gear and the behaviour of this part affects the overall life of the aircraft. In this paper, a new up-lock system is designed for a surface friction of 0.35 between steel to steel to prevent any slippage due to own weight of the landing gear. Initial design calculations of the up-lock hook are carried out to determine all the required dimensions. A plunger system which works in tandem with the up-lock hook is also designed. The loads that the up-lock hook has to bear in the worst condition is determined and the analysis is carried out to find out the reliability of the designed up-lock hook. For the applied load, the bending stresses occurred over the up-lock hook are less than the yield strength for the designed up-lock hook model in both static and dynamic conditions. The stresses occurred during static and dynamic loading conditions are 240 N/mm2 and 1180 N/mm2 respectively which are lower than the yield strength of the selected material, maraging steel.
Landing Gear, Up-lock System, g-forces, Design and Analysis
