Fuel dump was pretty common in the old days. We had it on 58Ts in the North Sea on Bo105s I flew for BCalH and our Aero Contractors Dauphins in Nigeria. I remember one pilot in Nigeria who had overfilled his tanks offshore deciding to dump a small amount of fuel on the rig deck. However the jettison valve stuck open and several hundred litres were dumped. The deck was blocked for some hours and the pilot's red face on return was nothing to do with sunburn
