Accident
A four-engine aircraft, identified as a Hercules, departed Tehran-Mehrabad Airport on a training flight bound for Hamadan. The aircraft was carrying six crew members. At liftoff from runway 29R, the Hercules deviated to the right and crashed into an Iran Air Airbus A300B2-203 that had been towed. Both aircraft exploded instantly and were totally destroyed by a post-crash fire. All six crew members on board the Hercules were killed, as well as three people who were on board the Airbus.
Probable Cause
The official investigation stated that it is believed the Hercules went out of control upon takeoff following an engine failure.