NTSB CAROL · Event
Event DEN07LA152
Registry · N7476
FAA Aircraft Registry record.
Make / Model
SLINGSBY SWALLOW TYPE T.45
Year of manufacture
1968 · 39 years old at event
Engine
NONE NONE
Seats / Engines
1 seats · 1 engine
Last airworthiness date
19680727
ADS-B equipped
Yes — Mode-S AA0FB5
Registrant of record
CLAYTON HARRY L
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The pilot's failure to maintain aircraft control during a low altitude release resulting in an inadvertent stall/spin. Contributing factors were the pilot's decision to turn back to the airport at low altitude and the wind gust.
Factual narrative
On September 2, 2007, approximately 1545 central daylight time, a Slingsby Swallow Type T.45 glider, N7476, sustained substantial damage when it impacted terrain following a loss of control during takeoff from the Sunflower Aerodrome Gliderport (SN76), Hutchinson, Kansas. The private pilot, who was the sole occupant, was seriously injured. The aircraft was registered to Wichita Soaring Association, Inc., Wichita, Kansas, and operated by the pilot. The personal flight was being conducted under the provisions of Title 14 Code of Federal Regulations Part 91 without a flight plan. The local flight was originating at the time of the accident. According to the pilot's statement, the glider achieved flight as normal prior to rotation by the tow plane. As the glider continued along the runway "there seemed to be some sort of external downward force like a wind gust." The glider wheel touched the runway and the glider bounced into the air, "gaining altitude rapidly." The pilot released the glider tow line and continued straight. The pilot stated that "the tow plane was not in sight and there was an impression that the tow plane may have taken off." The pilot banked the glider to the right to return to the airport. During the turn, "the right wing stalled and the glider lost altitude rapidly." The glider impacted terrain to the west of the runway on airport property. According to the Pilot/Operator Aircraft Accident/Incident Report (NTSB Form 6120.1), Recommendation section (How could this accident/incident have been prevented?), the pilot stated, "A small turn to the right to place the glider slightly right and out of the way of the tow plane with a landing straight ahead on the remaining runway." Examination of the accident site by a Federal Aviation Administration inspector revealed that the glider came to rest inverted. The forward fuselage was destroyed, and both wings were separated from the airframe. No anomalies were noted with the glider systems. At 1552, the automated weather observation from Hutchinson Municipal Airport, located approximately 9 miles north of the accident site, reported variable winds at 6 knots, visibility 10 statute miles, sky clear, temperature 32 degrees Celsius, dew point 11 degrees Celsius, and an altimeter setting of 30.12 inches of Mercury. The glider achieved flight as normal prior to rotation by the tow plane. As the glider continued along the runway there seemed to be some sort of external downward force like a wind gust. The glider wheel touched the runway and the glider bounced into the air, gaining altitude rapidly. The pilot released the glider tow line and continued straight. The pilot stated that the tow plane was not in sight and there was an impression that the tow plane may have taken off. The pilot banked the glider to the right to return to the airport. During the turn the right wing stalled and the glider lost altitude rapidly. The glider impacted terrain to the west of the runway on airport property. The pilot stated that the accident could have been prevented by making a small right turn and landing straight ahead on the remaining runway. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2007_DEN07LA152.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, loss of control). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- Semantic Scholar 2016 · Article (Interacción)
Trajectory Recovery System: Angle of Attack Guidance for Inflight Loss of Control
This paper describes the design and development of an ecological display to aid pilots in the recovery of an In-Flight Loss of Control event due to a Stall (ILOC-S).
- NTSB Aircraft Accident Reports 2010 · Accident report
Loss of Control on Approach — Colgan Air Flight 3407
Colgan Air 3407 / Continental Connection (Q400) Buffalo NY, February 12, 2009 — 50 fatalities. Definitive investigation of the Colgan 3407 stall-stick-pusher crash on approach to Buffalo.
- 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)
A Scoping Review of Aviation Loss of Control Inflight Research
Loss of control – inflight (LOC-I) contributes to aircraft accidents at unacceptably high rates. Significant industry efforts and research have aimed to improve LOC-I prevention, detection, and recove…
- arXiv 2025 · arXiv preprint
Quadratic Programming Approach to Flight Envelope Protection Using Control Barrier Functions
Ensuring the safe operation of aerospace systems within their prescribed flight envelope is a fundamental requirement for modern flight control systems.
- SKYbrary (Eurocontrol) 2024 · SKYbrary article
Loss of Control In-Flight (LOC-I) — SKYbrary Knowledge Base
SKYbrary comprehensive knowledge-base entry on Loss of Control In-Flight — definitions, contributing factors, accident case studies (Air France 447, Colgan 3407), and prevention strategies.
Browse the full corpus — academia portal ↗