CHI06LA207
2006-07-20 · Fergus Falls, Minnesota, United States · Serious · 1 aircraft · Status: Completed
Airport FFM
N507S has since been reassigned. It is now registered to a different aircraft (ZENITH CH 750 CRUZER, built 2022), which was not involved in this event.
Aircraft involved
Probable cause & findings
the fractured aileron bell crank and elevator clevis rod end.
Factual narrative
On July 20, 2006, at 2006 central daylight time, an experimental amateur-built Schlei Avid Flyer Speed Wing, N507S, owned and piloted by a private pilot, received substantial damage on impact with terrain during an emergency landing. The pilot reported a loss of control. Visual meteorological conditions prevailed at the time of the accident. The 14 CFR Part 91 personal flight was not operating on a flight plan. The pilot received serious injuries. The flight departed from Henning, Minnesota, and was returning to Fergus Falls, Minnesota. The pilot stated that after he descended from a cruise altitude of 4,000 feet and "shortly" after leveling off at 3,000 feet, he felt the airplane "kind of shake." Following the shake, the airplane pitched down with a "slight" left bank. He thought he was in a spin so he reduced engine power to idle and applied right rudder but there was no effect on airplane control. Out of "desperation," he began to move the control stick "all over," looking for anything that would return control. He moved the control stick as far aft as and to the right as possible. The airplane began to level off. Hoping to level the attitude some more, he tried moving the control stick again but the airplane began "going down again." He then moved the control stick to its previous position but did not remember if it had an effect on airplane attitude. He knew that he was going to "crash," so he turned the fuel off and was going to turn the master switch off but did not remember if he did. Examination of the flight control system by the Federal Aviation Administration revealed a broken front aileron bell crank (part identification F-5). Additionally, there was a broken elevator clevis rod end (part identification F-43), which had a fracture that was more than half rusted. An experimental amateur-built airplane impacted terrain during an emergency landing following a loss of control during cruise flight. Examination of the flight control system revealed a broken front aileron bell crank and a broken elevator clevis rod, which had a fracture that was more than half rusted. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2006_CHI06LA207.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
Matched on aircraft type or causal vocabulary (loss of control). All research papers
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER) A Scoping Review of Aviation Loss of Control Inflight Research
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- SKYbrary (Eurocontrol) 2024 · SKYbrary article Loss of Control In-Flight (LOC-I) — SKYbrary Knowledge Base
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- Semantic Scholar 2024 · Article (International Conference on Networking and Services) Risk Assessment of Loss of Control In-Flight Trajectories for Urban Air Mobility Safety
In Urban Air Mobility (UAM), maintaining a minimum separation between aircraft is a safety requirement, which becomes challenging amidst congested air traffic and off-nominal conditions, such as Loss …
- NTSB Aircraft Accident Reports 2022 · Accident report Loss of Control on Takeoff in Icing Conditions — Citation 560XL
Cessna Citation 560XL fatal takeoff icing accident, March 2018. Investigation of a Citation 560XL loss-of-control takeoff accident in icing conditions.
- Semantic Scholar 2021 · Article (Aviation) ANALYSIS OF GENERAL AVIATION FIXED-WING AIRCRAFT ACCIDENTS INVOLVING INFLIGHT LOSS OF CONTROL USING A STATE-BASED APPROACH
Inflight loss of control (LOC-I) is a significant cause of General Aviation (GA) fixed-wing aircraft accidents. The United States National Transportation Safety Board’s database provides a rich source…
- NASA NTRS 2021 · Presentation Use of Design of Experiments in Determining Neural Network Architectures for Loss of Control Detection
Abstract—We describe empirical methods for selecting a neural network architecture to implement belief state inference on generic commercial transport aircraft.