 More advanced systems were developed.Older TAWS, or deactivation of the EGPWS, or ignoring its warnings when airport is not in its database, or even the entire EGPWS altogether still leave aircraft vulnerable to possible CFIT incidents.In April 2010, a Polish Air Force Tupolev Tu-154M aircraft crashed near Smolensk, Russia, in a possible CFIT accident killing all passengers and crew, including the Polish President.