What happened
During takeoff from a 600-foot airstrip, the pilot of a Piper PA-18 applied the second notch of flaps as the aircraft reached the end of the runway. The airplane became airborne for approximately 20 feet before settling into nearby brush. A passenger on board noted an impression that the aircraft lacked or lost sufficient power to maintain flight. Notably, another company PA-18 operating at the same site was able to ferry all individuals away from the location without difficulty.
The investigation
An examination of the engine revealed significant mechanical wear. Specifically, an exhaust cam lobe was found to be 30-40% worn, and the associated cam follower exhibited a worn, dish-shaped appearance. The depth of these worn areas had exceeded the depth of the nitrated surface. Records from the Director of Maintenance indicated that a 50-hour inspection had been performed prior to this flight, during which metal particles were discovered in the oil screen.