NTSB CAROL · Event
Event CHI02CA203
Registry · N9B
FAA Aircraft Registry record.
Make / Model
BILGRI DAVID ZENITH ZODIAC 601HD
Year of manufacture
2003
Engine
AMA/EXPR UNKNOWN ENG
Seats / Engines
2 seats · 1 engine
Last airworthiness date
20031220
ADS-B equipped
Yes — Mode-S AC6A93
Registrant of record
BILGRI DAVID
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The pilot's failure to maintain sufficient airspeed while maneuvering to return to the airport. A reduction in handling quality and the distraction due to the open canopy were contributing factors.
Factual narrative
On July 19, 2002, at 1030 central daylight time, a Bilgri Sonerai II LTS, N9B, owned and piloted by a private pilot, sustained substantial damage when it impacted terrain during initial climb from runway 8 (5,069 feet by 100 feet, dry/asphalt) at the Dodge County Airport (UNU), Juneau, Wisconsin. Visual meteorological conditions prevailed at the time of the accident. The personal flight was operating under the provisions of 14 CFR Part 91 without a flight plan. The pilot reported minor injuries. The local flight was originating at the time of the accident. In his written report, the pilot stated "I borrowed a handheld device that . . . would give prop rotation speed. I distrusted the device reading when pointing through the windscreen, therefore I opened the canopy slightly, extending my hand outside to obtain a reading. When done, I closed the canopy. I made an error by not returning to my checklist which includes 'Safety the canopy latch'. The takeoff started normally. The canopy flew open while still over the runway. I decided insufficient runway remained for landing, so I proceeded up to several hundred feet altitude. The aircraft handled very poorly, although I had control. I attempted a slow turn back to the airport, briefly losing control. I regained control but lost altitude, finding myself on the ground but unable to avoid the fence line." FAA records indicate the pilot holds a private pilot certificate with an airplane single-engine land rating, and a third class medical certificate issued October 2001. The pilot reported 139 hours total time, 11 hours within the past 90 days, and 11 hours in the same make and model as the accident aircraft. Weather conditions at the scene were reported by the pilot as clear, 10 miles visibility and no turbulence. Dodge County AWOS, at 1535 UTC, reported conditions as 8,000 scattered with 10 miles visibility, and winds from 060 degrees at 4 knots. The unlatched canopy opened during takeoff roll. While returning to the airport, the pilot briefly lost control (stalled) and, although control was regained, the aircraft lost sufficient altitude and descended into terrain. Shortly after impact, the aircraft hit a fence row and was substantially damaged. The pilot sustained minor injuries. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2002_CHI02CA203.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, 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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