(2) Disconnection of the PinIt is highly probable that after the Aircraft landed at Fukuoka Airport, the Pin was disconnected during landing roll. From the detailed investigation on the disconnected Pin, it is probable that because the dimensional stability and mechanical strength of the threads were deteriorated by corrosion developed in the threads, the Pin assembly could not withstand the loading in a direction of pulling out the nut that occurred when the torque links moved in the horizontal direction during the steering operations, the threads were chipped away and deformed, and nut being torn, which led to the disconnection of the Pin. Where and when the nut was disconnected could not be determined because the nut and others were not retrieved.