Russia’s fifth-generation Su-57 fighter jet crashed in the Khabarovsk Region in the Far East due to a technical failure of the aircraft control system, two sources in the defense industry told TASS on Tuesday.

"According to the preliminary information, the crash is due to a failure of the Su-57’s control system," one of the sources said.

As the other source noted, most likely, "the tail control failed."

Russia’s United Aircraft Corporation reported earlier on Tuesday that a Su-57 fighter aircraft had crashed during a test flight in Komsomolsk-on-Amur 111 km from the home airfield. The aircraft’s emergency system responded in the normal mode and the pilot ejected to safety. A special commission will establish the causes of the crash, the corporation said.

A source in military medical circles told TASS that the doctors had examined the pilot and found no injuries.

This is the first crash of Russia’s fifth-generation Su-57 fighter jet.