NYC07CA151
2007-06-27 · Warren, Vermont, United States · None · 1 aircraft · Status: Completed
Airport 037
Aircraft involved
Probable cause & findings
The glider's inadvertent encounter with windshear. A factor was the outflow from a nearby thunderstorm.
Factual narrative
According to the LET Super Blanik L23 flight instructor, he and a student pilot were towed to 2,700 feet above the airport, where the student pilot performed a series of maneuvers. Afterwards, the student pilot descended the glider toward a midfield downwind entry, about 1,500 feet above the airport. While descending, turbulence from an approaching rain shower increased, so the flight instructor took the controls. The flight instructor flew the remainder of the downwind leg, followed by a base leg, at 70 knots with full spoilers deployed since the glider would not descend. Turning onto final, while heading into the wind, the glider experienced an "extremely strong" sink rate, from which, the flight instructor could not recover. The glider subsequently landed hard about 100 feet short of the runway causing substantial damage. Shortly after the landing, light rain fell on the airport, and there was thunder in the distance. Ten minutes later, there was lightning about 2 miles southeast of the airport, and the winds dropped and remained at less than 10 knots the rest of the afternoon. The flight instructor reported over 9,600 hours of flight time with 3,700 hours as a pilot in command of gliders. The LET Super Blanik L23 flight instructor and a student pilot were towed to 2,700 feet above the airport, where the student pilot performed a series of maneuvers. Afterwards, the student pilot descended the glider toward a midfield downwind entry, about 1,500 feet above the airport. While descending, turbulence from an approaching rain shower increased, so the flight instructor took the controls. The flight instructor flew the remainder of the downwind leg, followed by a base leg, at 70 knots with full spoilers deployed since the glider would not descend. Turning onto final, while heading into the wind, the glider experienced an "extremely strong" sink rate, from which, the flight instructor could not recover. The glider subsequently landed hard about 100 feet short of the runway causing substantial damage. Shortly after the landing, light rain fell on the airport, and there was thunder in the distance. Ten minutes later, there was lightning 2 miles southeast of the airport, and the winds dropped and remained at less than 10 knots the rest of the afternoon. The flight instructor reported over 9,600 hours of flight time with 3,700 hours as a pilot in command of gliders. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2007_NYC07CA151.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
Matched on aircraft type or causal vocabulary (turbulence, thunderstorm). All research papers
- NASA NTRS 2019 · Contractor Report (CR) An Examination of Aviation Accidents Associated with Turbulence, Wind Shear and Thunderstorm
The focal point of the study reported here was the definition and examination of turbulence, wind shear and thunderstorm in relation to aviation accidents.
- NASA NTRS 2019 · Reprint (Version printed in journal) Observations of severe turbulence near thunderstorm tops
Data derived from the flight tapes of two airliners that experienced severe turbulence near thunderstorm tops are used to produce quantitative descriptions of the turbulence and its environment.
- NASA NTRS 2019 · Conference Proceedings Operational evaluation of thunderstorm penetration test flights during project Storm Hazards '80
The National Aeronautics and Space Administration is conducting a research project called Storm Hazards '80 in order to study the prediction, detectability and avoidance of the hazards of severe storm…
- NASA NTRS 2019 · Reprint (Version printed in journal) Severe Turbulence and Maneuvering from Airline Flight Records
Digital flight records from reported clear-air turbulence incidents are used to determine winds and turbulence, to determine maneuver g loads, and to analyze control problems.
- arXiv 2026 · arXiv preprint Direct Numerical Simulations of Ice-Ocean Boundary Turbulence
Turbulent heat and freshwater transport at ice-ocean interfaces controls glacier and iceberg melt rates, yet the underlying physics remains poorly constrained.
- arXiv 2025 · arXiv preprint Explainable LiDAR 3D Point Cloud Segmentation and Clustering for Detecting Airplane-Generated Wind Turbulence
Wake vortices - strong, coherent air turbulences created by aircraft - pose a significant risk to aviation safety and therefore require accurate and reliable detection methods.