NTSB CAROL · Event
Event DEN99LA169
Aircraft involved
Probable cause & findings
A inadvertent stall during initial climb following takeoff. Factor were: high gross weight, high density altitude, inadequate preflight planning and preparation, and soft terrain.
Factual narrative
On September 23, 1999, at 1335 mountain daylight time, a Schweizer G-164A, N8731H, impacted terrain following takeoff from Cotton City Airport, a private facility, near Animas, New Mexico. The aircraft sustained substantial damage and the commercial pilot received minor injuries. The flight was an aerial application flight operating under Title 14 CFR Part 137. Visual meteorological conditions prevailed and no flight plan was filed. According to information supplied by witnesses and the pilot, both of whom provided verbal statements to the New Mexico State Police, the aircraft appeared to stall/mush during initial climb following takeoff from the 2640-foot dirt airstrip. In his written statement, the pilot provided information that the aircraft did not have a mechanical failure or malfunction but began to "shudder and settle" immediately following lift off and he attempted to conduct a forced landing to a field. During landing roll, the aircraft nosed over in soft terrain. Based on a reported full fuel load and full chemical load, the computed aircraft weight at the time of the accident was 4,500 pounds, which is the maximum certificated gross weight. No performance data was available. Weather conditions at the time of the accident were visual conditions with variable wind at 6 knots and a computed density altitude of 7,400 feet above mean sea level (msl). On an aerial application flight, during initial climb following takeoff at maximum gross weight and a density altitude of 7,400 feet, the aircraft entered a stall/mush condition. The pilot attempted a forced landing in a field, which was soft, and the aircraft nosed over during landing roll. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1999_DEN99LA169.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 (stall). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- 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 …
- arXiv 2023 · arXiv preprint
Automating Bird Diverter Installation through Multi-Aerial Robots and Signal Temporal Logic Specifications
This paper tackles the task assignment and trajectory generation problem for bird diverter installation using a fleet of multi-rotors.
- arXiv 2023 · arXiv preprint
Variation of Critical Crystallization Pressure for the Formation of Square Ice in Graphene Nanocapillaries
Two-dimensional square ice in graphene nanocapillaries at room temperature is a fascinating phenomenon and has been confirmed experimentally.
- arXiv 2023 · arXiv preprint
Polycrystallinity enhances stress build-up around ice
Damage caused by freezing wet, porous materials is a widespread problem, but is hard to predict or control. Here, we show that polycrystallinity makes a great difference to the stress build-up process…
- arXiv 2022 · arXiv preprint
Enhanced Prediction of Three-dimensional Finite Iced Wing Separated Flow Near Stall
Icing on three-dimensional wings causes severe flow separation near stall. Standard improved delayed detached eddy simulation (IDDES) is unable to correctly predict the separating reattaching flow due…
- Embry-Riddle Scholarly Commons 2021 · Journal article (JAAER)
Analysis on the Negative Emotional, Physiological, and Cognitive Responses Elicited from of the Activation of a Stall Alarm
Failing to identify an aerodynamic stall can lead to the inability of an aircraft to sustain flight. To warn pilots of an impending or fully-developed stall, many aircraft have safety devices installe…
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