Incident Overview
A training flight departed Tehran-Mehrabad Airport for a local training mission. While cruising south of Tehran, the crew declared an emergency after experiencing an engine failure and elected to return to the airport.
Emergency Descent and Radome Detachment
During the emergency descent to runway 29L, the radome mounted on the roof of the aircraft detached and struck the tail. The impact caused the aircraft to lose control.
Crash and Fatalities
The aircraft crashed in an open field near Varamin. Upon impact, the aircraft disintegrated. All seven occupants were killed.
Investigation
Investigators believe that the radome detached because the aircraft's speed exceeded its certification limits during the emergency descent. No other causes have been stated.