NTSB CAROL · Event
Event ATL91LA184
Registry · N42LF
FAA Aircraft Registry record.
Make / Model
ROBINSON HELICOPTER R44 II
TCDS
H11NM · ROBINSON HELICOPTER CO
Seats / Engines
4 seats · 1 engine
ADS-B equipped
Yes — Mode-S A4FA46
Registrant of record
ROBINSON HELICOPTER CO
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
THE LOSS OF ENGINE POWER AS A RESULT OF CARBURETOR ICING.
Factual narrative
THE FEDERAL AVIATION ADMINISTRATION (FAA) INSPECTOR STATED THAT THE HOME BUILT AIRCRAFT COLLIDED WITH A TREE OFF THE APPROACH END OF RUNWAY 36 AT THE SMALL SOD AIRPORT. THE AIRCRAFT THEN IMPACTED THE TERRAIN IN A NOSE DOWN ATTITUDE, AND CAME TO REST ABOUT 600 FEET SHORT OF THE APPROACH END OF RUNWAY 36. THE INSPECTOR STATED THAT THE ENGINE DID NOT APPEAR TO BE RUNNING AT THE TIME OF IMPACT, AND THE CARBURETOR HEAT WAS IN THE ON POSITION. EXAMINATION OF THE ENGINE REVEALED NO MALFUNCTION. THE TEMPERATURE AND DEW POINT IN THE AREA AT THE TIME OF THE ACCIDENT WERE CONDUCIVE TO EXTREME CARBURETOR ICING AT CRUISE AND CLIMB POWER SETTINGS. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1991_ATL91LA184.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 ↗