Primary finding
Probable cause
The glider pilot’s failure to release from the towline after the tow plane experienced a loss of engine power.
Investigator assessment
Analysis narrative
The tow plane and glider on tow had just lifted from the runway during takeoff when the tow plane experienced a loss of engine power. The tow plane landed straight-ahead on the runway. The glider continued in flight until it reached the limit of the tow rope and was pulled suddenly to the runway. The glider’s nose was crushed and the empennage separated. Examination of both the tow plane and the glider revealed no preimpact mechanical anomalies. A postaccident operational check of the airplane’s engine revealed no anomalies, and the tow release mechanism on the glider functioned normally. According to the FAA Glider Flying Handbook, “Upon losing sight of the towplane, the glider pilot must release immediately.” Further, “…if the towplane loses power after the glider is airborne, the glider pilot should pull the towline release, [and] land ahead…”