Helmet,
Thanks for the comments, I'll see what I can amend to cover some of them. Point taken about low level ops being restricted if applied to other aircraft, but this is specifically the Bell 206 supplement. I'd hoped that Para D3.4 (c) and (d) were dealing with separate issues, but I see how they can be read to be the same, and I'll research the issue of para E. It was all written a few years ago....
Lord G,
I'd venture to suggest that it is in the lap of the Gods whether it can
always be flown away from. Given a trained and capable pilot, and as you say suffient altitude and airspace, it should be recoverable,
BUT it happens extremely quickly, and will consume heaps of altitude before all stops whizzing around
Those I know who have encountered LTE and recovered could not stress enough how sudden and sever the onset is, often with little or no warning.