toolguy wrote,
There was a very bad S61 accident in the North Sea in the early 90's when wind shifted stack heat into the landing path. It was a very hot day for the NS anyway, but it was enough for them to hit very hard then roll off.
If this was the incident on the Brent Spar, then flare gases were not to blame, as the Spar didn't have a flare. The S61 hit the A-frame of the crane alongside the helideck, landed heavily on the deck before rolling off into the sea.
bondu