Accident Sequence
Shortly after takeoff, the pilot observed a loss of oil pressure on both engines and initiated a left turn to return to the airport. During the landing attempt, the aircraft departed the right side of runway 12 and collided with parked aircraft, substantially damaging two Cessna 150s and destroying a Piper PA-32.
Engine Inspection
Examination of both engines revealed 9x5 inch holes on the top of the crankcases. In each engine, two connecting rods had separated. These findings indicate catastrophic internal failure.
Oil Viscosity Considerations
Engine logbooks showed that the oil had been changed on October 16, 1981 using oil equivalent to SAE 40 weight. The Lycoming operator's manual, which was present with the aircraft records, recommends SAE 20 oil for operations at temperatures below 10 degrees Fahrenheit. The ambient temperature at the time of the accident was -15 degrees Fahrenheit. The use of higher viscosity oil in cold conditions may have led to inadequate lubrication.