(CNN) -- Polish President Lech Kaczynski's plane, which crashed Saturday in western Russia, killing Kaczynski and scores of other people, was overhauled last year, according to the general director of the company that performed the service.
Alexei Gusev, the general director of Aviakor Factory, told CNN that the plane, a Tupolev-154, received major refurbishing and repair in December 2009. The work included rebuilding all of the engines, he said.
His company also provided the Polish government with repair and maintenance parts for the next six years.
"The plane has been in use very little since that major repair," Gusev said. "Speaking openly, we believe that this tragedy could not have been caused by equipment failure."