NutLoose: Ref your Post #10 regarding towbars attached to aircraft undergoing maintenance reminds me of a visit a bunch of us made to the MU at St. Athan about a hundred years ago. A Valiant (I did say it was a long time ago) was quite clearly in the middle of a very deep maintenance check - with the towbar still attached. It didn't take long for someone to ask the obvious question and we were told that if anything occurred in the hangar that could endanger the aircraft, the tow-tug that was permanantly parked outside the hangar would be connected and pull the aircraft out of the hangar - in whatever condition it was in. If I remember correctly, this particular aircraft was up on jacks and minus its undercarriage. I've often wondered if that particular requirement was the result of a previous incident/accident or just precautionary. Interesting to hear that in this age of modern fire fighting/suppression systems etc., it's still followed. Apologies for thread drift.