The BBC News website has some quite extraordinary footage of an old TU-154 filmed on April 29 this year that makes a rollercoaster look positively tame...
http://www.bbc.co.uk/news/world-europe-13286479
The plane behaviour is under investigation, as you would expect. I would imagine that it was a very uncomfortable ride for the crew.
The 154 was, at one time, the workhorse of the Soviet, and post Soviet, airlines, only a handful are still in service amongst the lesser known regionals.
Apparently this plane was on the way to a maintenance station when the fault happened....scary stuff to watch and the pilots need commending for keeping the plane in the air under such circumstances.
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There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss.
~ Douglas Adams, Hitchhikers Guide to the Galaxy