Narrative:

After landing, while taxiing back to my hangar, a sudden gust of wind nosed the aircraft over onto its back. There was no damage to any property or injury to any person.

Google
 

Original NASA ASRS Text

Title: A BIPLANE PLT RPTS THAT HIS ACFT WAS FLIPPED OVER ON ITS BACK BY A GUST OF WIND WHILE TAXIING IN.

Narrative: AFTER LNDG, WHILE TAXIING BACK TO MY HANGAR, A SUDDEN GUST OF WIND NOSED THE ACFT OVER ONTO ITS BACK. THERE WAS NO DAMAGE TO ANY PROPERTY OR INJURY TO ANY PERSON.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.