What happened
During a climb through 6,000 feet, the aircraft experienced a loss of oil pressure. In response to the mechanical issue, the pilot requested permission to return to the airport of departure. Air traffic control suggested an alternative, more proximal airport for the landing. To manage the engine failure, the pilot performed engine shutdown procedures and feathered the propeller before initiating a power-off descent.
Due to the aircraft's current altitude, the pilot opted for a downwind approach toward runway 12L. During the landing sequence, the aircraft overshot the runway and landed beyond the departure end of the pavement. The aircraft continued past the runway, breaching the airport perimeter fence and colliding with several trees, a sign post, a light pole, and a vehicle. The sequence concluded when the aircraft came to a stop within a residential neighborhood.
Findings
An investigation into the wreckage determined that the loss of oil pressure was caused by an oil leak. Specifically, the oil filler cap had been improperly adjusted following its initial installation. It was noted that the maintenance manual prohibits any field-level repairs regarding the mechanisms used to secure the oil filler cap. Additionally, the aircraft's flaps were positioned at a 7° intermediate setting at the time of the accident.