What happened
Shortly after departing on a right turn from Runway 31L, the aircraft's engine ceased operation at an altitude of approximately 1,000 feet above ground level. The pilot immediately initiated a return to the airport and determined that Runway 13L was within reach for a safe landing. As the aircraft approached the runway threshold, the pilot lowered the landing gear in preparation for touchdown. However, the left main landing gear failed to lock into the down position. Upon impact with the runway surface, the unretracted gear caused the aircraft to skid off the left side of the paved surface.
The investigation
Following the accident, mechanics performed a detailed teardown of the engine to determine the root cause of the sudden power loss. Examination of the internal components revealed a fatigue fracture of the number four crankshaft cheek. This structural failure within the engine block was identified as the primary mechanical reason for the engine quitting during flight.
Findings
The investigation highlighted several critical factors contributing to the outcome. The engine failure occurred at a low altitude, leaving minimal time for recovery or alternative planning. Although the pilot successfully navigated back to the airport and selected an appropriate runway, the mechanical integrity of the landing gear system was compromised. The left main gear's inability to lock prior to touchdown resulted in significant ground damage as the aircraft departed the runway environment.