Didn't an F-15E splash an Iraqi heli with an LGB during Desert Storm ? I remember the Hog guys got two gun kills against helis and I think there were a couple more, but I don't know if any of the helis had seen the threat and were manoeuvring against them.
I also seem to recall that a Pucara downed the Scout that was on its way to pick up H Jones at Goose Green; heard about that a very long time ago, though, so happy to stand corrected.