NTSB CAROL · Event
Event SEA07CA193
Aircraft involved
Probable cause & findings
The student pilot's improper use of the throttle and cyclic, and the certified flight instructor's inadequate supervision, which resulted in the collision with terrain.
Factual narrative
The certified flight instructor (CFI) and student pilot were practicing hover autorotations. The CFI noted that the student had expressed difficulty with sufficient pedal inputs in the past, and the helicopter would yaw excessively to the left. The CFI demonstrated the maneuver to the student, showing him to establish the helicopter in a 2-foot hover, look outside and pick a reference point to maintain heading, position his hand on the throttle to roll it off, and as throttle is rolled off, prepare to apply right pedal to counteract the left yaw. The student pilot then assumed the controls and configured the helicopter for the hovering autorotation. The CFI had his left hand on the collective, his right hand on the cyclic, and his feet were guarding the pedals. The student counted down, "three, two, one…" and rolled the throttle on while adding right pedal. The helicopter yawed hard and fast to the right and the student pulled aft cyclic. The CFI attempted to regain control of the helicopter; however, the tail cone contacted the ground and the helicopter came to rest on its left side. The CFI stated that there were no mechanical malfunctions with the helicopter, prior to the accident. The certified flight instructor (CFI) and student pilot were practicing hover autorotations. The CFI noted that the student had expressed difficulty with sufficient pedal inputs in the past, and the helicopter would yaw excessively to the left. The CFI demonstrated the maneuver to the student, showing him to establish the helicopter in a 2-foot hover, look outside and pick a reference point to maintain heading, position his hand on the throttle to roll it off, and as throttle is rolled off, prepare to apply right pedal to counteract the left yaw. The student pilot then assumed the controls and configured the helicopter for the hovering autorotation. The CFI had his left hand on the collective, his right hand on the cyclic, and his feet were guarding the pedals. The student counted down, "three, two, one…" and rolled the throttle on while adding right pedal. The helicopter yawed hard and fast to the right and the student pulled aft cyclic. The CFI attempted to regain control of the helicopter; however, the tail cone contacted the ground and the helicopter came to rest on its left side. The CFI stated that there were no mechanical malfunctions with the helicopter, prior to the accident. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2007_SEA07CA193.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 ↗