Witness and Radar Observation
The aircraft was observed flying straight and level when the sounds of the engine were heard to increase. The only witness subsequently saw the aircraft nose over and dive into the ground. Radar tracking of the flight path confirmed this sequence of events.
Investigation Findings
The investigation revealed that the aircraft was being flown by a student pilot on his first flight. Additionally, the student pilot was reported to be under a great deal of pressure at the time.
Aircraft Examination
Examination of the aircraft and its engine did not disclose any evidence of preimpact failure or malfunction. The airframe and powerplant appeared to have been in working order prior to impact.
Conclusion
No probable cause was determined from the available evidence. The investigation did not identify any mechanical or structural issues.