NTSB CAROL · Event
Event ERA25LA040
Aircraft involved
Probable cause & findings
An encounter with a foreign object, which resulted in a loss of control and collision with terrain.
Factual narrative
The pilot was conducting tree trimming operations on a power line right of way that consisted of a 10-blade aerial saw that was slung below the helicopter. During the cutting, a saw blade snagged a 1/2-inch cable that wrapped itself around the lower saw blades. A section of the cable broke off and struck the tail rotor assembly, damaging the stabilizers and tail rotor drive shaft. The helicopter lost all tail rotor authority and began an uncontrolled yaw, impacting the trees as it descended to the terrain where it came to rest on its left side. The impact resulted in substantial damage to the airframe and rotor blades. The operator did not report that there were any preimpact mechanical failures or malfunctions of the helicopter that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12
NTSB Findings
Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).
- — Environmental issues-Physical environment-Object/animal/substance-Wire-Effect on equipment
- — Aircraft-Aircraft propeller/rotor-Tail rotor drive system-Tail rotor drive shaft-Damaged/degraded
- — Aircraft-Aircraft structures-Empennage structure-Horizontal stabilizer-Damaged/degraded
Verbatim from NTSB's published report. Source file
NTSB_2024_ERA25LA040.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 (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.
- 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…
- 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.
- 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.
- NASA NTRS 2021 · Conference Paper
Use of Design of Experiments in Determining Neural Network Architectures for Loss of Control Detection
We describe empirical methods for selecting a neural network architecture to implement belief state inference on generic commercial transport aircraft.
Browse the full corpus — academia portal ↗