"Poland intends to use their second Tu-154 for an experiment..."
That's not "intends to use", that is "is already experimenting". The first news was a guy in Poland who commented on the Smolensk blog that that TU is wooshing by his house, did seven approaches and cuts them every time at what seemed to him to be "about 80 metres height."
I am proud of our TU :o))))))))) it survived already 5 days of trials :o))))))))))
But then that's a twin brother of that first TU, made to order, fixed to order, all spare parts genuine factory made, not those old planes USSR times that have shortage of everything when are to be fixed (USSR being no more suppliers of TU parts are also, in larger part, non-existant) - that others have to be content with.
I trust in that second TU and think if they will skip the fog and Kachinsky on board and Northern aerodrome "conveniences" to be on the safe side - it might survive the tests :o)))))))))))