Moscow:  A pilot instructor and his student were killed in a crash of a trainer aircraft in southern Russia on Saturday. The single-engine plane operated by the local air club 'Dostupnoye Nebo' (accessible sky) crashed outside Rostov-on-Don in the afternoon.

Technical malfunction was cited as a preliminary cause, said rescue services and transport investigators.

The federal aviation watchdog said the plane had lost speed and fell into uncontrollable spin, according to preliminary investigation.