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
August 16, 1991 · Air Tractor AT-502 · N4535K
Clovis, NM
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 16, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Clovis, NM
Aircraft
Air Tractor AT-502
Tail Number
N4535K
Operator
Gregory L Kubin
Injuries
None
Aircraft Damage
Destroyed
NTSB Number
DEN91LA114
THE PILOT WAS FLYING HIS LAST SWATH RUN OF THE DAY AT DUSK. HE SAID HE DIDN'T SEE A RISE IN THE TERRAIN AT THE END OF THE FIELD AND ALLOWED THE AIRCRAFT TO STRIKE A DIRT BERM. THE AIRCRAFT ENGINE IMMEDIATELY CAUGHT FIRE. HE DUMPED HIS LOAD OF FERTILIZER/FUNGICIDES AND LANDED THE AIRCRAFT. THE FIRE DESTROYED THE AIRCRAFT.
NTSB Probable Cause
FAILURE OF THE PILOT TO MAINTAIN CLEARANCE FROM RISING/UNEVEN TERRAIN. FACTORS RELATED TO THE ACCIDENT WERE: THE LIGHT CONDITIONS AT DUSK, AND THE LACK OF VISUAL CUES FOR THE PILOT.
Full Narrative
THE PILOT WAS FLYING HIS LAST SWATH RUN OF THE DAY AT DUSK. HE SAID HE DIDN'T SEE A RISE IN THE TERRAIN AT THE END OF THE FIELD AND ALLOWED THE AIRCRAFT TO STRIKE A DIRT BERM. THE AIRCRAFT ENGINE IMMEDIATELY CAUGHT FIRE. HE DUMPED HIS LOAD OF FERTILIZER/FUNGICIDES AND LANDED THE AIRCRAFT. THE FIRE DESTROYED THE AIRCRAFT.
Flight
Event TypeAccident
Event Time19:41 MDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionGrd
Aircraft
AircraftAir Tractor AT-502
Tail NumberN4535K
Aircraft CategoryAir
DamageDestroyed
OperatorGregory L Kubin
Operating RulePart 137
Engines1
Engine TypeTurboprop
Engine DetailsP&W · PT6A-34 · Turboprop · 750
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 43 · Second Class
Conditions
ConditionsVMC
LightDusk
Wind135° @ 2 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO