A plane crash at the Hawke's Bay Airport, from which two people walked away unscathed, is under investigation by the Civil Aviation Authority (CAA).
A CAA spokesman said the "occurrence", on Sunday, had been reported to them.
"[It was done] in line with the operator's requirements under Part 12 of the Civil Aviation Rules, and has been assigned to one of our Safety Investigators for investigation."
The light plane, named Wichita Girl, upended in a Sunday afternoon wind gust at Hawke's Bay Airport while it was in Napier for the Art Deco Festival.
The biplane was flipped on its back on one of the airport's grass runways.