It looks like the crash that resulted in the grounding of all Russia's Su-27s may have been caused by a pilot blackout. 5.5g doesn't sound like all that much, not for a professional fighter pilot at least, but the definition of "continuous" is I guess what matters. Me, I doubt if I could take that much for even a minute, but I don't do that sort of thing for a living. Still, I imagine it'll let all the guys at Sukhoi sleep again at night.