Just a small point but Boeing 'bogies' are called trucks. (Bogies get up their nose) <img src="tongue.gif" border="0">
The problem is related to wear causing loss of the plating on the pin, followed by moisture ingress and corrosion. If this condition remains undetected, the corrosion leads to cracking and ultimately failure of the pin. It may manifest as rotating or migrating pins, but heavy corrosion can freeze the pin and hamper detection. The problem is being addressed by redesigned pins and bushings, samples of which are already being service tested on selected aircraft (or airplanes as Boeing calls them) among the world fleet. In the meantime, and despite the redesign, the existing pins shouldn't fracture as described so long as they are lubricated exactly as specified in the MM, using the correct grease and inspected at the recommended intervals. If you can't get fresh grease out of the joint when greasing, then you may already have a problem... But there's been nothing new about any of that since bushings and pins were first invented. All LAEs know that. Don't we?
**********************************. .Through difficulties to the cinema