Methinks Raw Data is totally correct in what he says here -- it is indeed very old news and I seem to recall it was first imposed back in the early nineties due to a four engine flameout on an Ansett Western Australia 146 that very nearly ploughed in. I think the crew managed to get just two relit at extremely low altitude.
I'm somewhat surprised to see it posted here as 'news or rumour' some 10 years later. Is it possible that some operators of the type are not aware of this problem? Surely not.