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 4, 1990 · Hughes 500D · N1107G
Kennsington, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 4, 1990
Injury Outcomes
1 injury (1 serious injury), 2 uninjured
Location
Kennsington, AK
Aircraft
Hughes 500D
Tail Number
N1107G
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
ANC91FA001
THE PILOT-IN-COMMAND WAS UNABLE TO FIND A FLAT SPOT TO SET THE HELICOPTER ON TO PICK UP HIS PASSENGERS. HE NOSED THE HELICOPTER INTO THE SIDE OF THE MOUNTAIN AND MAINTAINED THE AFT PORTION OF THE SKIDS AT A HOVER. THE PASSENGERS LOADED THEMSELVES AND WERE STRAPPED IN WHEN THE PILOT BEGAN HIS TAKEOFF. HE APPLIED POWER AND THE HELICOPTER BEGAN SETTLING AFT. HE CONTINUED TO APPLY POWER AND THE HELICOPTER ROLLED OVER ONTO ITS LEFT SIDE AND TURNED 90 DEGREES TO ITS LEFT. THE PILOT DID NOT RECALL HEARING AN ENGINE-OUT WARNING AND THE CIRCUIT BREAKER WAS FOUND IN THE OUT POSITION. EXAMINATION OF THE HELICOPTER AND TEST RUN OF THE ENGINE SHOWED NO REASON FOR A LOSS OF ENGINE POWER OR MECHANICAL FAILURE. THE TERRAIN WAS UNEVEN AND VERY ROCKY.
NTSB Probable Cause
THE LOSS OF CONTROL DURING TAKEOFF DUE TO DYNAMIC ROLLOVER. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT-IN-COMMAND'S SELECTION OF AN UNEVEN LANDING AREA.
Full Narrative
THE PILOT-IN-COMMAND WAS UNABLE TO FIND A FLAT SPOT TO SET THE HELICOPTER ON TO PICK UP HIS PASSENGERS. HE NOSED THE HELICOPTER INTO THE SIDE OF THE MOUNTAIN AND MAINTAINED THE AFT PORTION OF THE SKIDS AT A HOVER. THE PASSENGERS LOADED THEMSELVES AND WERE STRAPPED IN WHEN THE PILOT BEGAN HIS TAKEOFF. HE APPLIED POWER AND THE HELICOPTER BEGAN SETTLING AFT. HE CONTINUED TO APPLY POWER AND THE HELICOPTER ROLLED OVER ONTO ITS LEFT SIDE AND TURNED 90 DEGREES TO ITS LEFT. THE PILOT DID NOT RECALL HEARING AN ENGINE-OUT WARNING AND THE CIRCUIT BREAKER WAS FOUND IN THE OUT POSITION. EXAMINATION OF THE HELICOPTER AND TEST RUN OF THE ENGINE SHOWED NO REASON FOR A LOSS OF ENGINE POWER OR MECHANICAL FAILURE. THE TERRAIN WAS UNEVEN AND VERY ROCKY.
Flight
Event TypeAccident
Event Time15:20 AKDT
Nearest Airport0nm N
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 500D
Tail NumberN1107G
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20-B · Turboshaft · 420
Seats5
People & Injuries
Injury Summary1 injury (1 serious injury), 2 uninjured
Fatal0
Serious1
Minor0
Uninjured2
Total3
Crew 1Age 32 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility60 sm
CeilingNone
Temperature / Dew Point37 C / 0 C
Altimeter0
Weather SourcePILO