Maybe Imechanica can start an investigation. I have collected some data from BBC, WSJ and Wikipedia.   Tu-154 is not new to accidents, 66 serious accidents already.  Some have been from mechanical problems (two cases prior to 2001).  Is there also here a mechanical problem?  Imechanica should play its role for first time as "wikipedia" investigation.
Plane
Crash May Strain Poland’s Ties With Russia

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A portrait of President Lech Kaczynski of Poland lay