Narrative:

The incident occurred after touch down. I think the gear collapsed as a result of striking a berm/hole. The gear collapse allowed the propeller to strike the ground.

Google
 

Original NASA ASRS Text

Title: ACFT EQUIP PROB. GEAR COLLAPSED ON LNDG. RPTR THINKS IT WAS CAUSED BY HITTING A BERM OR HOLE.

Narrative: THE INCIDENT OCCURRED AFTER TOUCH DOWN. I THINK THE GEAR COLLAPSED AS A RESULT OF STRIKING A BERM/HOLE. THE GEAR COLLAPSE ALLOWED THE PROP TO STRIKE THE GND.

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.