Abstract
When an aircraft was performing flight tasks, it was found that one connecting bolt of No. 3 main wheel was missing during the short stop inspection. The bolt uses 148 ups and downs this time, and the use time is significantly lower than normal. It is inferred that the high probability of its fracture is not caused by long-term use, and it is speculated that the fracture reason is related to the quality of the bolt itself. Material analysis showed that there were no obvious abnormalities in the bolt material, and slight scratches were found near the bolt. The bolt is fatigue fracture and the fracture position is located at the transition arc position. Microscopic observation shows that there is a V-shaped groove on the side of the crack source area, but because the gasket is no longer in the installation position, it cannot directly determine the installation problem of the gasket. It is recommended to optimize the installation process and NDT (No Destructive Testing, NDT) detection process in the future.
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