The 58-year-old pilot was killed on 17 October 2016 at Bourn Airfield, near Cambridge.
The air accident report found the flap setting resulted in "excess drag" during take-off, and affected the climb of the plane so much that it went into a nose-dive and then impacted on the ground.
The AAIB commented that it was one of a number of incidents where a pilot had mistakenly used the wrong wing flap setting and the AAIB recommended that particular mention of this should be made in training.
The pilot was described at the time of the crash as "meticulous" and "experienced".
Source; BBCNEWS, AAIB
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