Seeing those float bags on the wheels takes me back to an incident in Port Harcourt Nigeria, in the seventies. The bags were off for inspection and repacking, when one of our engineers was checking the electric's, he connected a test lamp to the left hand connection after removing the plug, he then armed the float switch, forgetting that the Two sides are cross connected, so that one switch will fire both floats.
I was sitting at my desk, when there was an almighty bang, and a portable compressor came flying through the office window, it landed on my Nigerian clerks desk, luckily he was out having a smoke.
One of our other engineers was walking across the hangar with the right hand float bag in his hands, about to fit it, luckily he had not got too far, or he would have got a bag straight on his chest.
There was a lot of luck that day, and it goes to show the force of these things.