What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Aircraft was in cruise flight headed north over the water of turnagain arm, inbound into Anchorage. Pilot smelled burning oil and engine began "sounding odd". Airman turned aircraft and headed south towards the shoreline. Aircraft engine started losing power, which continued until engine stopped. Airman made emergency landing on shoreline. Upon landing, nose wheel caught on rough terrain and aircraft flipped over. Heavy oil leakage was visible on belly and right (passenger) side of aircraft.
Inspection of aircraft after recovery showed the b nut on the high pressure oil supply line fitting going into oil cooler had backed out from the hose approximately one full rotation, allowing engine oil to spray out onto belly and right side of aircraft.
As the FAA filed it
AIRCRAFT WAS IN CRUISE FLIGHT HEADED NORTH OVER THE WATER OF TURNAGAIN ARM, INBOUND INTO ANCHORAGE. PILOT SMELLED BURNING OIL AND ENGINE BEGAN "SOUNDING ODD". AIRMAN TURNED AIRCRAFT AND HEADED SOUTH TOWARDS THE SHORELINE. AIRCRAFT ENGINE STARTED LOSING POWER, WHICH CONTINUED UNTIL ENGINE STOPPED. AIRMAN MADE EMERGENCY LANDING ON SHORELINE. UPON LANDING, NOSE WHEEL CAUGHT ON ROUGH TERRAIN AND AIRCRAFT FLIPPED OVER. HEAVY OIL LEAKAGE WAS VISIBLE ON BELLY AND RIGHT (PASSENGER) SIDE OF AIRCRAFT.
INSPECTION OF AIRCRAFT AFTER RECOVERY SHOWED THE B NUT ON THE HIGH PRESSURE OIL SUPPLY LINE FITTING GOING INTO OIL COOLER HAD BACKED OUT FROM THE HOSE APPROXIMATELY ONE FULL ROTATION, ALLOWING ENGINE OIL TO SPRAY OUT ONTO BELLY AND RIGHT SIDE OF AIRCRAFT.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.