Accident Sequence
According to witness statements, at approximately 250 feet above ground level (AGL), the sounds from the engine indicated that power was reduced to idle. The aircraft then entered a steep left turn while descending. Shortly before impact, power was reapplied.
Background
The certified flight instructor (CFI) was known to have conducted simulated engine failures with other students shortly after takeoff. An open field is located adjacent to the airport on the extended centerline of the runway.
Investigation Findings
Disassembly of the engine revealed no mechanical malfunctions that would have caused an interruption of power. The investigation did not identify any specific cause for the reduction in engine power or the subsequent maneuvers.
Conclusion
The investigation determined that no mechanical issues were present in the engine. The sequence of events, as described by witnesses, involved a reduction in power at low altitude followed by a steep descending turn.