What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
After departing grass runway pilot noticed oil on the windscreen and returned to the airport for precautionary landing. Upon landing roll-out the nose wheel sank in snow and muddy conditions resulting in the aircraft flipping over on it's back. Structural damage occured to the vertical stablizer and rudder. Pilot did not observe any abnormal aircraft issues during preflight to include oil leaks, or missing cap. Post accident it was noted that the oil cap was not secured in the closed and locked position.
As the FAA filed it
AFTER DEPARTING GRASS RUNWAY PILOT NOTICED OIL ON THE WINDSCREEN AND RETURNED TO THE AIRPORT FOR PRECAUTIONARY LANDING. UPON LANDING ROLL-OUT THE NOSE WHEEL SANK IN SNOW AND MUDDY CONDITIONS RESULTING IN THE AIRCRAFT FLIPPING OVER ON IT'S BACK. STRUCTURAL DAMAGE OCCURED TO THE VERTICAL STABLIZER AND RUDDER. PILOT DID NOT OBSERVE ANY ABNORMAL AIRCRAFT ISSUES DURING PREFLIGHT TO INCLUDE OIL LEAKS, OR MISSING CAP. POST ACCIDENT IT WAS NOTED THAT THE OIL CAP WAS NOT SECURED IN THE CLOSED AND LOCKED POSITION.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.