Originally Posted by GotTheTshirt
Some towbars have a secondary link that prevents the head from becoming completely detached. Probably to avoid just that !
That's the one, and it is not designed to fail on the designs i've seen... The result is that the shear-pins give protection for the steering and max angle, but the bolt keeping the head attached to the towbar will not prevent pushing or pulling the nosegear out of the aircraft..