"Landing systems’ incompatibility may have caused the crash" – military analyst

Speaking to RT, defense analyst and former Polish military pilot Mikhal Fisher noted a previously unmentioned factor that possibly was one of the reasons for the crash.

"In the Soviet Union/Russia they use a unique instrumental landing system called PRMG. It works almost exactly the same way as the international Western system ILS. However, the two are not compatible. The Polish airplane was modified to use the ILS, as the [Soviet] airplane was mainly flying to various airports that use it," Fisher told RT.

Former test pilot Magomed Tolboev told RT that of all the crashes in which the TU-154 aircraft has been involved, only 10 per cent were caused by technical problems.

“It’s a very secure plane” Tolboev assured.