Accident Sequence
Shortly after takeoff, the aircraft experienced a loss of engine power at an altitude between 150 and 200 feet above ground level. The pilot executed a forced landing in rough terrain. During the landing, the left wing and landing gear separated from the aircraft.
Engine Examination
Post-accident examination of the engine identified a failed exhaust valve guide and soft valve springs. The condition of these components was attributed to blow-by heat.
Maintenance History
At the time of the accident, the engine had accumulated 3,571 hours since its last overhaul and 186 hours since its most recent annual inspection. According to Avco-Lycoming Service Letter L201B, the recommended time between overhauls for this engine type is 1,800 hours.