Polish Government Tu154M crash

[Ptkay]

The plane carrying the president was also equipped with a flight management system (FMS), by the American company Universal Avionics Systems and TAWS (Terrain Awareness and Warning System). To make these devices work properly, appropriate maps must be loaded onto the disks, including land survey map of Smolensk region. AFAIK, perhaps these maps were not loaded, although probably NATO has them, because it can not be commercially purchased.