There are 3 engines in the TU-154 plane, and if two of them are out of order, it can operate with one. Dmitry Adbashyan, the President of the National Aviation Association of the Republic of Armenia, commenting on the cause of Tehran-Yerevan air crash stated, assuming that one of the engines flamed up and the crew made an error. “It is possible the crew took all the necessary steps, but they were not sufficient,” Adbashyan said.

But why did the air plane crash? Adbashyan did not exclude terrorist act possibility.

The sand –storms on the Iranian territory is one of the disaster causes, Adbashyan stated.

The expert said that it is an option too, as flying in case of sand-storm and volcano is very dangerous.