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The plane landed nose first Photo AAIB
He was taken to hospital having sustained a fractured vertebra, broken ribs, severe face lacerations, a broken wrist and broken thumb.
The AAIB report said: "The aircraft was performing a flying display with several other vintage aircraft when the aircraft was seen to enter a descending right turn.
"The aircraft did not recover from the descent and struck the ground in a steep nose-down attitude.
"The pilot suffered serious injuries.
The pilot suffered serious injuries
"It is likely that the aircraft entered a spin, although the possibility that the initial departure was a spiral dive could not be eliminated.