What happened
During a takeoff operation, a tow plane experienced a significant pitch excursion that led to a stall and subsequent impact with the terrain. The glider pilot involved in the tow reported that the takeoff proceeded normally until reaching an altitude of approximately 100 to 150 feet above the ground. At this height, the tow plane began to out-climb the glider, causing slack to develop in the tow line. Fearing the glider was approaching its stall speed while attempting to follow the aircraft, the glider pilot released from the tow.
Witnesses at the scene observed the aircraft pitch nose-high on two separate occasions before it entered a right-hand spin and impacted the ground. One witness, who had flown the same aircraft on 12 previous flights that day, reported no operational issues or mechanical problems during those prior flights. Other witnesses noted that engine noise remained normal throughout the event.
The investigation
A post-accident examination of the aircraft revealed no mechanical anomalies that would have impaired its flight capabilities. However, toxicological testing performed on samples from the pilot identified the presence of phentermine, ephedrine, and pseudoephedrine. Phentermine is a prescription stimulant, while ephedrine and pseudoephedrine are components found in over-the-counter medications and possess stimulant properties.