Incident Overview
During an instructional flight, the engine suffered a sudden loss of oil pressure. As the oil pressure dropped, the engine RPM also decreased. This situation led to the pilot performing a forced landing.
Forced Landing and Nose-Over
During the forced landing, the airplane nosed over and came to rest in an inverted position.
Post-Accident Examination
After the accident, very little oil was found in the engine system. The oil had been blowing out through the engine breather system. The operator reported that after recovering the wreckage, they blocked off the breather system and pressurized it to 15 psi. Despite this test, they could not find any mechanical issue that might have pressurized the crankcase during flight.