The BBC's Adam Easton reports from Warsaw that there had been calls for Polish leaders to upgrade their planes.
And in late 2008 Mr Kaczynski had suffered a couple of scares. Problems with the aircraft's steering mechanism delayed his departure from Mongolia, forcing him to take a charter flight to Tokyo, and a week later the plane was caught up in turbulence flying to Seoul.
However, the aircraft had recently undergone a major overhaul and Aleksey Gusev, the head of the maintenance plant that carried out the work, told Polish TV that it should not have had technical problems.
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