N982Q

On June 12, 1994, at 1200 eastern daylight time, a Beech P35, N982Q, collided with trees during a forced landing near Bluffton, South Carolina. The commercial pilot and two passengers were not injured. The aircraft was destroyed. The flight was operated under 14 CFR Part 91 by SRQ Flyers, Inc. Visual meteorological conditions existed at the time, and an instrument flight rules flight plan was in effect for the personal flight to Garner, North Carolina. The flight originated in Sarasota, Florida, at 1010.

The pilot reported that during cruise flight, he smelled burning oil, and there was no oil pressure indication on the gauge. He turned toward the closest airport, and advised Air Traffic Control of the problem. The propeller oversped a few seconds later. The throttle was retarded, and the engine continued to lose power until the propeller stopped turning. The aircraft descended into clouds at about 6,000 feet mean sea level (msl), and remained in the clouds until reaching about 1,600 feet msl. As he exited the clouds, it was apparent that the aircraft could not make the closest airport. A forced landing was attempted at a nearby golf course. The aircraft touched down on a fairway, and maximum braking was applied. The aircraft could not be stopped in an open area, and it collided with trees.

The engine was examined following the accident. The examination revealed oil had leaked out of the engine via the oil filter adapter. The engine was disassembled, and there was evidence of heat distress and a lack of lubrication on all main and connecting rod bearings. The number two cylinder wall and piston were scored from operation at elevated temperatures. The engine oil sump contained about one quart of oil.

An examination of the threads on the oil filter adapter revealed that about 60 to 70 percent of the thread pitch diameter had been fretted away. The mating threads on the engine case were also fretted. A rubber "o" ring, which fits between a jam nut and the engine case, was damaged in several areas around its circumference. There was evidence of inadequate torque on the jam nut. It is not known whether the inadequate torque resulted from a loss of preload torque, or from insufficient torquing during installation. The oil filter adapter was not supplied with the engine by the engine manufacturer. No maintenance records were located which identified when the adapter was last installed or inspected.