What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) During a 100 hour inspection of the aircraft, the oil drain plug was removed and a quick drain was installed. This quick drain was long enough to be contacted by the nose wheel when the landing gear was retracted, causing the engine oil to drain out of the engine during operation. While conducting flight instruction with the aircraft, the flight instructor noticed a low oil pressure condition and executed an emergency landing into rough terrain. The aircraft sustained substantial damage, but the occupants were not injured.
As the FAA filed it
(-23) DURING A 100 HOUR INSPECTION OF THE AIRCRAFT, THE OIL DRAIN PLUG WAS REMOVED AND A QUICK DRAIN WAS INSTALLED. THIS QUICK DRAIN WAS LONG ENOUGH TO BE CONTACTED BY THE NOSE WHEEL WHEN THE LANDING GEAR WAS RETRACTED, CAUSING THE ENGINE OIL TO DRAIN OUT OF THE ENGINE DURING OPERATION. WHILE CONDUCTING FLIGHT INSTRUCTION WITH THE AIRCRAFT, THE FLIGHT INSTRUCTOR NOTICED A LOW OIL PRESSURE CONDITION AND EXECUTED AN EMERGENCY LANDING INTO ROUGH TERRAIN. THE AIRCRAFT SUSTAINED SUBSTANTIAL DAMAGE, BUT THE OCCUPANTS WERE NOT INJURED.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.