NTSB CAROL · Event
Event LAX98LA221
Aircraft involved
Probable cause & findings
The failure of the pilot to attach the aileron quick disconnect fitting during assembly of the glider and his inadequate preflight inspection.
Factual narrative
On July 5, 1998, at 1335 hours Pacific daylight time, a Rolladen-Schneider LS-6 glider, N6686, collided with the ground during the takeoff initial climb at the Crystal Gliderport in Llano, California. The glider was destroyed and the pilot/owner, the sole occupant, suffered serious injuries. The local area personal flight was originating at the time of the accident and no flight plan was filed. Visual meteorological conditions prevailed. The airport owner observed the accident sequence and reported that on the initial takeoff roll, the right aileron and right wing were oscillating. He further reported that as the glider pilot rotated to about 10 feet agl, both wings appeared to be oscillating violently. Approximately 400 to 500 feet agl, the glider pilot released from the tow plane and went into a right spiral and impacted the ground. The airport owner opined that the glider pilot may not have released sooner because he may have attributed the oscillations to turbulence. The airport owner reported that he examined the glider after the accident. He stated that the glider is equipped with quick disconnect fittings on the control system located in the wing center section that allow it to be disconnected and reconnected as the wings are removed or installed. The right aileron fitting was found disconnected. The pilot reassembled the glider on the morning of the accident flight and witnesses did not see him perform a control continuity check prior to takeoff. The pilot does not remember the accident or the events leading up to it. The glider was towed aloft and witnesses observed the right wing oscillating. After release about 400 to 500 feet agl, the glider went into a right spiral and impacted the ground. The airport owner examined the glider after the accident and reported that the quick disconnect fitting for the right aileron was found disconnected. The pilot had reassembled the glider on the morning of the accident and did not perform a control continuity check prior to takeoff. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1998_LAX98LA221.txt.
Findings + structured fields enriched from FAA avall.mdb.
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Related research
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Academic papers and agency reports matching this event's aircraft type or causal vocabulary (stall, turbulence). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- Embry-Riddle Scholarly Commons 2021 · Journal article (IJAAA)
Comparative Study on the Prediction of Aerodynamic Characteristics of Mini - Unmanned Aerial Vehicle with Turbulence Models
When dealing with CFD simulations the turbulent nature is seen on most of the engineering flows and these flows need to be solved.
- arXiv 2020 · arXiv preprint
Numerical Simulation of Iced Wing Using Separating Shear Layer Fixed Turbulence Models
Aerodynamic prediction of glaze ice accretion on airfoils and wing is studied using the Reynolds-averaged Navier-Stokes method.
- NASA NTRS 2019 · Conference Paper
Prediction of stall and post-stall behavior of airfoils at low and high Reynolds numbers
An interactive boundary-layer method, together with the e(super n)-approach to the calculation of transition, has been used to predict the stall and post-stall behavior of airfoils at low and high Rey…
- 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.
- NASA NTRS 2026 · Conference Paper
Computational Analysis of Steady State Aerodynamics of Transonic Truss-Braced Wing Configuration in Deep Stall
This study presents a computational investigation of steady state aerodynamics of the Subsonic Ultra-Green Aircraft Research (SUGAR) Transonic Truss-Braced Wing (TTBW) configuration over a wide range …
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER)
Political Turbulence and Aviation Safety: A Cross-National Analysis of Political Stability's Effects on Aviation Accidents
To what extent does political stability affect aviation safety? This research aims to link domestic political conditions and public safety through the consideration of aviation accident frequency.
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