9000ft rate of descent is going some. A tangle with weather and stall? At FL330: probably not but then again, Air France managed it. Looks like an elevator failure to me, or maybe a trim runaway and break up. Three thousand hours each is plenty if the crews are decent, I don't believe that they were to blame. Now the plane. Must be elderly, or it wouldn't be flying freight. I'm sure the investigators will be all over the maintenance records. It's not just helicopters that hang by a bolt you know.