The Chair?

Iran says misaligned radar led to Ukrainian jet downing

Iran said that 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 authority said in a report late Saturday

https://twitter.com/AFP/status/1282235037723893760