I fired quite a few SS11 but only at stationary targets. I do reckon I could have hit a helicopter though. During the Falklands War a fellow Airgunner in a Scout told me that they were hiding in a valley in a low hover waiting for an air raid to pass when he saw an Argentinian Skyhawk flying towards them. He asked for permission to fire from his pilot who told him in no uncertain terms to forget it :-)