What happened
A local test flight departed from Tehran-Mehrabad Airport at 12:25 local time. Approximately 35 minutes after takeoff, the crew contacted air traffic control to report that the aircraft had experienced a double engine failure and that they had lost control of the plane.
The four-engine aircraft subsequently crashed in the Rudshur area, situated near the Shur River. There were seven fatalities among the occupants on board, with no survivors reported from the crash site.
Findings
Official investigations concluded that the primary factor in the accident was a double engine failure, though the specific underlying reason for the simultaneous loss of both engines remains undetermined.