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
May 9, 2023 · Robinson Helicopter R44 II · N704T
Skwentna, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 9, 2023
Injury Outcomes
2 injuries (2 minor injuries), 1 uninjured
Location
Skwentna, AK
Aircraft
Robinson Helicopter R44 II (2004)
Tail Number
N704T
Operator
Willow Creek Aviation
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ANC23LA032
The pilot reported that, he was flying uphill over an area of snow-covered, mountainous terrain, when he encountered flat light and whiteout conditions, which made it difficult to discern topographical features. In an attempt to maintain visual reference with the ground, he turned the helicopter to the right to fly back down the hill. Subsequently, the right landing gear skid contacted terrain and the helicopter entered a dynamic rollover to the right, resulting in substantial damage to the fuselage, tail boom, and powertrain system. The pilot reported that there were no preaccident mechanical malfunctions or anomalies that would have precluded normal operation.
NTSB Probable Cause
The pilot's failure to maintain adequate altitude/clearance from terrain while maneuvering in adverse weather conditions, which resulted in a dynamic rollover.
Full Narrative
The pilot reported that, he was flying uphill over an area of snow-covered, mountainous terrain, when he encountered flat light and whiteout conditions, which made it difficult to discern topographical features. In an attempt to maintain visual reference with the ground, he turned the helicopter to the right to fly back down the hill. Subsequently, the right landing gear skid contacted terrain and the helicopter entered a dynamic rollover to the right, resulting in substantial damage to the fuselage, tail boom, and powertrain system. The pilot reported that there were no preaccident mechanical malfunctions or anomalies that would have precluded normal operation.
Flight
Event TypeAccident
Event Time12:00 AKDT
Nearest Airport0nm
Flight Plan FiledCvfr
Flight Plan ActivatedYes
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRobinson Helicopter R44 II
Tail NumberN704T
Aircraft CategoryHeli
DamageSubstantial
OperatorWillow Creek Aviation
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-540-AE1A5 · Reciprocating · 260
Seats4
People & Injuries
Injury Summary2 injuries (2 minor injuries), 1 uninjured
Fatal0
Serious0
Minor2
Uninjured1
Total3
Crew 1Minor
Crew 2Age 45 · Second Class · Minor
Crew 3None
Conditions
ConditionsUnknown
LightDaylight
Wind130° @ 9 kt, gusting 18 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point48 F / 28 F
Altimeter29.82 inHg
Observation Time11:56
Weather SourceWFAC