in the very beg. of the discussion on the Russian avia blogs someone wrote that already after the plane engines fixing and internal ? panels lining (for more modern looks inside) in December in Samara factory, the Polish TU was additionally equipped in Poland with something good and American for navigation. Sorry for "something good" it is my ineterpretation :o) I simply didn't understand the abbreviations.
Anyway here is a link to reconstruction of how a piece of a wing flew off away (possibly) after hanging on a bit, after meeting with the birch tree.
The green line is the correct glissade, leading to the runway, the red line is the one the plane was following, and after the hit with 2 trees it swayed leftward somehow.
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