The Air Algerie flight that crashed in Mali last week appears to have plummeted to the ground from an altitude of 10,000 meters in just a few minutes after flying into a storm, a senior official involved in the investigation was quoted as saying (www.businessinsider.com) さらに...
Well, they are talking wx. IDK about 708, but AF447 took about 110 minutes or so. Something bad happened on top. That fast a fall sounds like a nose down dive.
Microbursts are more common near the ground. Now a downdraft could be possible... But you would think they would have the sense to fly around a storm exceeding FL330.
Fast fall like the LAM 470 where the pilot intentionally crashed in the Caprivi Strip in north-eastern Namibia. I'm not suggesting anything intentionally for this Air Algerie flight, mind you, but in the LAM 470 the plane disintegrated in the air, nothing so far indicates the same happened to Air Algerie. The flight recorders will tell us the story I hope.
Speculation for sure, but it is possible that they had horizontal stab. failure similar to ASA261. Not too many things can cause an aircraft to descend so rapidly other than direct input by the pilots or catastrophic failure of a flight control surface (either mechanical failure or failure due to say a bomb).
AF447 was a high altitude stall, but the stall was fully developed, both wings were equally stalled and it stayed roughly wings level. Being a t-tail this aircraft could have entered a deep stall and a flat spin which would have been unrecoverable.