Investigation Summary
The aircraft involved was a unique asset for the Iranian Air Force, originally an Iraqi 'Adnan 2' AWACS that was flown to Iran during the 1991 Gulf War. It had been refurbished with Iranian-made radar systems and returned to service in 2008. During the 2009 Sacred Defense Week parade, the aircraft was performing a flyby near Tehran. According to technical accounts, the crew reported an engine fire and attempted to maneuver for an emergency landing on runway 29L at Mehrabad International Airport. During this high-stress maneuver, the large rotodome mounted atop the rear fuselage detached from its supports. The massive structure was swept back by the airflow and struck the vertical stabilizer, shearing it off. Without its tail fin, the Il-76 entered an unrecoverable flat spiral. A video captured by the crew of a nearby C-130 shows the aircraft falling with its rear fuselage and tail missing before impacting the ground in a massive fireball.
Final Conclusions
The primary cause of the accident was the structural failure of the radar dome's attachment points, which led to the radome striking and destroying the aircraft's tail fin. This failure was likely precipitated by an in-flight engine fire and the aerodynamic loads experienced during the subsequent emergency maneuvering. The loss of the vertical stabilizer rendered the aircraft uncontrollable.
Video Analysis
Iranian AWACS Crash (2009) — Footage captured from a nearby C-130 showing the Ilyushin Il-76MD 'Simorgh' spiraling toward the ground after losing its tail section.
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Airframe & Maintenance
Systems & Failure Modes
Radar Dome (Radome)
A large, saucer-shaped structure mounted on struts above the rear fuselage containing the AEW&C radar antenna. Its detachment caused the catastrophic tail strike.
Vertical Stabilizer
The tail fin providing directional stability; it was sheared off by the departing radome, making the aircraft impossible to fly.
Interesting Facts
- 01The aircraft was Iran's only functional AWACS-equipped aircraft at the time of the crash.
- 02It was originally an Iraqi Air Force aircraft; while the Adnan 1 variant was named 'Baghdad', this specific airframe (MSN 0083484542) was an Adnan 2 variant.
- 03The crash occurred during a parade intended to be a send-off for President Mahmoud Ahmadinejad's trip to the UN.
- 04Video evidence confirmed the aircraft was missing its tail section during the final descent.
- 05The aircraft was manufactured in 1988 and had been upgraded by Russian technicians in Iran.
Safety Actions & Advisories
Radome Attachment Inspection
Source ↗Following the accident, the IRIAF reportedly conducted structural integrity reviews of large external modifications on transport-category aircraft, specifically focusing on the mounting points of the rotodome on remaining Il-76 airframes.
Known Controversies & Unanswered Questions
Mid-air Collision vs. Structural Failure
Reference ↗Initial reports and some military sources claimed the Il-76 collided with an escorting F-5E Tiger II or HESA Saeqeh fighter. However, technical analysis and video footage later supported the theory that the radome detached due to structural failure or fire, striking the tail.