Overall Trends
Total, fatal, and serious accidents in the selected range.
Premium research interface
The modern interface for aviation safety intelligence.
Search investigations, review source evidence, monitor watched reports, and trace long-term patterns from one calm, data-first workspace.
63k+
Reports indexed
1940-2026
Coverage
Recent
Last data refresh
Search everything
Fast key and full-text search with live filters, watches, and precise metadata.
Use quotes for exact phrase matches (for example "fuel selector valve").
Featured Report
Safety trends by operating rule
Track fatal and non-fatal accident patterns across Part 91, Part 135, and Part 121 operations.
Loading trend charts…
High-signal investigations
Major cases, deep-report coverage, and investigation media across decades of NTSB history.
Browse the aviation graph
Move quickly by aircraft, airport, operator, and time with indexes built for research, not wandering.
Last Data Update
By Decade
By Month
Aircraft Manufacturer
More manufacturersAirports
More airportsOperators
More operatorsAbout
Aviation safety reports, made easier to study
NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.
The goal is practical safety education: make it faster to find relevant investigations, compare similar events, review factual records, and understand the evidence behind probable-cause and preliminary reports.
The investigative work and source records belong to the National Transportation Safety Board and the published investigation record. This site is not affiliated with or endorsed by the NTSB.
FAQs
NTSB Report
October 5, 2021 · Robinson Helicopter R66 · N266RK
Delta, MO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 5, 2021
Injury Outcomes
1 injury (1 minor injury)
Location
Delta, MO
Aircraft
Robinson Helicopter R66 (2014)
Tail Number
N266RK
Operator
Thompson Flying Service
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
CEN22LA006
The pilot reported that during spray operations the helicopter contacted a wire and then impacted terrain, which damaged the main rotor mast and tail boom. Following the accident, the pilot realized the poles holding the wire were concealed by trees and that he should have conducted a more thorough inflight survey of the spray area. The pilot reported no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
NTSB Probable Cause
The pilot’s inadequate inflight planning and his failure to see and avoid a wire which resulted in contact with the wire and subsequent ground impact.
Full Narrative
The pilot reported that during spray operations the helicopter contacted a wire and then impacted terrain, which damaged the main rotor mast and tail boom. Following the accident, the pilot realized the poles holding the wire were concealed by trees and that he should have conducted a more thorough inflight survey of the spray area. The pilot reported no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
Flight
Event TypeAccident
Event Time14:20 CDT
Nearest Airport0nm
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRobinson Helicopter R66
Tail NumberN266RK
Aircraft CategoryHeli
DamageSubstantial
OperatorThompson Flying Service
Operating RulePart 137
Engines1
Engine TypeTurboshaft
Engine DetailsRolls-Royce · RRE-200570 · Turboshaft · 300
Seats5
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 25 · Second Class · Minor
Conditions
ConditionsVMC
LightDaylight
Wind50° @ 7 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point64 F
Altimeter30.06 inHg
Observation Time13:53
Weather SourceWFAC