Many years ago I had to overwing refuel the 2R tank on an L1011 in AGP. Can't remember the quantities or flow rates involved but the hose and nozzle were exactly like those found on a petrol station forecourt and seemed to take forever. I was concerned that the very ropey looking bonding lead and crocodile clip would detach and drop into the tank. Its also worth remembering to leave all the loose articles in your shirt/overall pockets somewhere else because if anything falls out, Sods Law will probably ensure that it will also drop into the tank. Seem to remember our procedures at the time required a duplicate insp to the filler cap when the refuel was complete.