NTSB CAROL · Event
Event DEN99LA102
Aircraft involved
Probable cause & findings
Pilot incapacitation (loss of consciousness) due to dehydration and hyperventilation. Factors were the turbulence and excessive workload (task overload) that induced anxiety/apprehension, and striking the sign and the pole.
Factual narrative
On June 10, 1999, approximately 1520 mountain daylight time, a Schweizer SGU-2-22E, N5823V, owned and operated by the Civil Air Patrol, Inc., Maxwell AFB, Alabama, was substantially damaged when it collided with terrain during landing approach at Hobbs, New Mexico. The student pilot, the sole occupant aboard, was not injured. Visual meteorological conditions prevailed, and no flight plan had been filed for the local instructional flight being conducted under Title 14 CFR Part 91. The flight originated approximately 1500. The pilot wrote a statement for CAP officials on June 10, 1999. He said he had been doing steep turns at 1,000 feet [agl (above ground level)]. He began to "feel funny," so he started to roll out of the turn and "blacked out" about the time the glider struck a stop sign. The glider then flew below some powerlines. The pilot landed in a field and the glider struck a pole on the ground. The pilot wrote a second statement that accompanied his NTSB accident report, dated June 24, 1999. He said his instructor approved the solo flight. "The winds were not bad enough to where I could not solo," he wrote. There was some crosswind from the south and the tow was "fairly rough." He released from the tow at 2,000 feet agl, in turbulence, and ascended in a thermal to 5,000 feet agl. The pilot said he was "being frustrated" by the turbulence, and was "having trouble controlling the plane," so he decided to land. He began to get "frustrated and nervous." He was "breathing really hard because [he] was scared." He started to "feel strange" and his face and hands "felt numb. . .like they had fallen asleep." He began to see "a lot of little dots" and "passed out." He regained consciousness just before striking a stop sign. He then flew under some powerlines, landed in a field, and struck a pole embedded in the ground. A third statement (almost identical to the second) was written on August 3, 1999, and accompanied a second NTSB accident report. Mark Kennedy and Jon McKinley witnessed the accident and submitted statements as to their observations (attached). Although the pilot was uninjured in the accident, he was transported to the Lea Regional Medical Center where he was examined and released. The pilot's parents signed a release and their son's medical records were given to an FAA inspector. The physician who examined the pilot told CAP officials that he was dehydrated. This, together with his hyperventilating, probably caused the brief lapse of consciousness. The official diagnosis was "vasovagal syncope." The pilot said his tow aloft had been 'fairly rough,' and he released at 2,000 feet, in turbulence, and ascended in a thermal to 5,000 feet. He was 'frustrated' by the turbulence, and was 'having trouble controlling the plane,' so he decided to land. He began to get 'frustrated and nervous' and started 'breathing really hard because [he] was scared.' He began to 'feel strange,' and his face and hands 'felt numb. . .like they had fallen asleep.' He began to see 'a lot of little dots,' and he 'passed out.' He regained consciousness just before striking a stop sign. He flew under some powerlines, then landed in a field, and struck a pole embedded in the ground. A physician said the pilot was dehydrated and had hyperventilated, causing the brief lapse of consciousness. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1999_DEN99LA102.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (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.
- 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.
- 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.
- 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.
- arXiv 2024 · arXiv preprint
Does small-scale turbulence matter for ice growth in mixed-phase clouds?
Representing the glaciation of mixed-phase clouds in terms of the Wegener-Bergeron-Findeisen process is a challenge for many weather and climate models, which tend to overestimate this process because…
- arXiv 2023 · arXiv preprint
Effects of electrostatic interaction on clustering and collision of bidispersed inertial particles in homogeneous and isotropic turbulence
In sandstorms and thunderclouds, turbulence-induced collisions between solid particles and ice crystals lead to inevitable triboelectrification.
- SKYbrary (Eurocontrol) 2023 · SKYbrary article
Wake Vortex Turbulence — SKYbrary Knowledge Base
SKYbrary wake vortex turbulence comprehensive article — generation mechanics, dissipation factors, separation standards (ICAO LIGHT/MEDIUM/HEAVY/SUPER + recategorisation RECAT-EU).
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