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
July 31, 2006 · Air Tractor AT-400 · N23720
Springfield, MN
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
July 31, 2006
Injury Outcomes
No injuries (1 uninjured)
Location
Springfield, MN
Aircraft
Air Tractor AT-400
Tail Number
N23720
Operator
Dlux Spray Service
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI06CA221
The airplane ground looped following a failure of one of the tail wheel bolts. The pilot reported that he was landing at a private grass airstrip when the accident occurred. He reported that upon landing the tail wheel broke and the airplane ground looped. Inspection of the airplane revealed that it traveled into a bean field during the ground loop and that the bottom bolt on the tail wheel assembly fractured which resulted in a loss of directional control.
NTSB Probable Cause
The pilot's inability to maintain directional control of the airplane as a result of the partial failure of the tail wheel assembly. A factor associated with the accident was the crop that the airplane contacted.
Full Narrative
The airplane ground looped following a failure of one of the tail wheel bolts. The pilot reported he was landing at a private grass airstrip when the accident occurred. He reported that upon landing the tail wheel broke and the airplane ground looped. Inspection of the airplane by a Federal Aviation Administration Inspector from the Minneapolis, Minnesota Flight Standards District Office revealed the airplane traveled into a bean field during the ground loop. The inspector reported the bottom bolt on the tail wheel assembly fractured which resulted in the loss of directional control.
Flight
Event TypeAccident
Event Time13:45 CDT
Nearest Airport0nm
Flight Plan FiledNone
Aircraft FireNo
Aircraft
AircraftAir Tractor AT-400
Tail NumberN23720
Aircraft CategoryAir
DamageSubstantial
OperatorDlux Spray Service
Operating RulePart 137
Engines1
Engine TypeTurboprop
Engine DetailsPratt & Whitney · PT6A · Turboprop
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 41 · Second Class · None
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 12 kt, gusting 20 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO