A Singapore Airlines A330 lost both engines during cruise at FL390.
Weather was reported as "bad" from various reports I've heard. What bad is I'm not sure. Singapore is very much tropical so thunderstorms are the norm around there.

Upon inspection the engines appeared normal and the aircraft returned to Singapore after a two hour delay.

Have you ever come across this before Lou?
All engines quitting at once.

FADEC controllers I presume would be the responsibility of engine manufacturers?
http://www.dailymail.co.uk/travel/travel_news/article-3098861/Singapore-Airlines-plane-plunges-13-000-FEET-Rolls-Royce-engines-fail-hitting-bad-weather-South-China-Sea.html