NTSB CAROL · Event
Event FTW99LA234
Aircraft involved
Probable cause & findings
The improper touchdown by the flight instructor.
Factual narrative
On August 23, 1999, at 1140 central daylight time, a Hughes 269B helicopter, N44KH, was substantially damaged during a practice autorotational landing at the Russellville Regional Airport, Russellville, Arkansas. The helicopter was owned and operated by Metco Helicopters, Inc., of Springdale, Arkansas. The flight instructor was not injured and his pilot rated passenger sustained minor injuries. Visual meteorological conditions prevailed, and a flight plan was not filed for the 14 Code of Federal Regulations Part 91 local personal flight. The flight instructor reported to the FAA inspector that he was practicing an autorotation, terminating with power, to the sod area between the taxiway and runway, near the eastern end of the runway. The flight instructor stated that the engine lost power after he initiated the autorotation by lowering the collective and reducing the throttle to idle. The helicopter touched down "hard" in a nose high attitude. The main rotor blades contacted the tailboom severing it about 24 inches forward of the tail rotor gearbox. The helicopter rotated about 160 degrees to the left and came to a stop upright. According to the FAA inspector, the main rotor blades were removed, and an engine run was completed with no duplication of power loss. The flight instructor was practicing an autorotation terminating with power to the sod area between the taxiway and runway. The flight instructor stated that the engine lost power after he initiated the autorotation by lowering the collective and reducing the throttle to idle. The helicopter touched down 'hard' in a nose high attitude. The main rotor blades contacted the tailboom, severing it about 24 inches forward of the tail rotor gearbox. The helicopter rotated about 160 degrees to the left and came to a stop upright. According to the FAA inspector, an engine run was completed with no duplication of power loss. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1999_FTW99LA234.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 (icing). 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 · Contractor Report (CR)
Icing Physics Studies Using the 3D SIDRM Test Article: 2023 Icing Tests Analysis
In-flight icing is an important safety issue and is a factor that affects aircraft design and performance. Newer regulations are driving a need for improvements in airframe and engine icing simulation…
- arXiv 2025 · arXiv preprint
Multi-Agent Deep Reinforcement Learning for UAV-Assisted 5G Network Slicing: A Comparative Study of MAPPO, MADDPG, and MADQN
The growing demand for robust, scalable wireless networks in the 5G-and-beyond era has led to the deployment of Unmanned Aerial Vehicles (UAVs) as mobile base stations to enhance coverage in dense urb…
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER)
A Mathematical Model on the Temporal Dynamics of Aviation Competitive Pricing
This study investigates the competitive dynamics of airport pricing using U.S. airport data to validate the findings. It employs linear and nonlinear ordinary differential equation models to analyze t…
- NASA NTRS 2025 · Presentation
NASA Icing Update – March 2025
This NASA Icing Update was prepared for presentation to the SAE International AC-9C Inflight Icing Technology Committee. This update includes the following topics: planned Rotational Icing Scaling tes…
- arXiv 2024 · arXiv preprint
An energy-stable phase-field model for droplet icing simulations
A phase-field model for three-phase flows is established by combining the Navier-Stokes (NS) and the energy equations, with the Allen-Cahn (AC) and Cahn-Hilliard (CH) equations and is demonstrated ana…
- NASA NTRS 2024 · Presentation
NASA Icing Update – Oct 2024
This presentation provides a status update on select NASA icing research activities for the SAE AC-9C Icing Technical Committee Meeting on Oct 21, 2024.
Browse the full corpus — academia portal ↗