I was wondering what 'chalks' were, but I thought better keep your trap shut and don't show your ignorance! Is my understanding correct that aeroplanes stored in hangars never have their brakes on, or is that a light aeroplane thing only? Bigger planes with equipment attached would obviously have parking brake set?
I don't know what to call it. Ground collision is one thing, but when you get incidents like the Saudia 747 under tow, the Astraeus 737 at Gatwick last winter, and this, it's hardly a 'ground collision' I think. When you are driving something and it hits something else, that's a 'collision' Wild things, out of control......any offers?. 'Hangar balls-up'?