Iranian authorities say the main reason for the January incident that killed 176 was human error in aligning the radar.

Iran has said the misalignment of an air defence unit’s radar system was the key “human error” that led to the accidental downing of a Ukrainian passenger plane in January.

“A failure occurred due to a human error in following the procedure” for aligning the radar, causing a “107-degree error” in the system, the Iranian Civil Aviation Organisation (CAO) said in a report late on Saturday.

This error “initiated a hazard chain” that saw further errors committed in the minutes before the plane was shot down, said the CAO document, presented as a “factual report” and not as the final report on the accident investigation.

Flight 752, a Ukraine International Airlines plane, was struck by two missiles and crashed shortly after taking off from Tehran’s main airport on January 8, at a time of heightened US-Iranian tensions.

Iran admitted several days later that its forces accidentally shot down the Kyiv-bound plane, killing all 176 people on board.     

‘Wrong identification’

The CAO said despite the erroneous information available to the radar system operator on the aircraft’s trajectory, he could have identified his target as an airliner, but instead, there was a “wrong identification”.

The report also noted that the first of the two missiles launched at the aircraft was fired by a defence unit operator who had acted “without receiving any response from the Coordination Centre” on which he depended.

The second missile was fired 30 seconds later, “by observing the continuity of trajectory of the detected target”, the report added.

Tehran’s air defences had been on high alert at the time the jet was shot down in case the US retaliated against Iranian strikes hours earlier on American troops stationed in Iraq.

Those strikes were carried out in response to the killing of a top Iranian general, Qassem Soleimani, in a US drone attack near Baghdad airport.

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