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
June 26, 1989 · Piper PA-18-150 · N4137Z
Durango, CO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 26, 1989
Injury Outcomes
No injuries (1 uninjured)
Location
Durango, CO
Aircraft
Piper PA-18-150
Tail Number
N4137Z
Operator
Lavern D St Clair
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN89LA148
DURING A GLIDER TOW FLT, THE PLT TOOK OFF TO THE SOUTH. AFTER RELEASING THE GLIDER, HE RETURNED & LANDED TO THE NORTH WITH A 5 KT QUARTERING TAILWIND. AS HE WAS LANDING, THE ACFT VEERED RIGHT. THE PLT OVERCORRECTED TO THE LEFT & THE PLANE TURNED SHARPLY LEFT, THEN THE RIGHT WING STRUCK THE GROUND & WAS DAMAGED.
NTSB Probable Cause
THE PILOT FAILED TO MAINTAIN DIRECTIONAL CONTROL, WHICH RESULTED IN AN INADVERTENT GROUNDLOOP/SWERVE. A FACTOR RELATED TO THE ACCIDENT WAS: THE ADVERSE WIND CONDITION.
Full Narrative
DURING A GLIDER TOW FLT, THE PLT TOOK OFF TO THE SOUTH. AFTER RELEASING THE GLIDER, HE RETURNED & LANDED TO THE NORTH WITH A 5 KT QUARTERING TAILWIND. AS HE WAS LANDING, THE ACFT VEERED RIGHT. THE PLT OVERCORRECTED TO THE LEFT & THE PLANE TURNED SHARPLY LEFT, THEN THE RIGHT WING STRUCK THE GROUND & WAS DAMAGED.
Flight
Event TypeAccident
Event Time10:15 MDT
Nearest AirportVALAIR (0nm N)
Runway36
Runway Length3100 ft
Runway Width100 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-18-150
Tail NumberN4137Z
Aircraft CategoryAir
DamageSubstantial
OperatorLavern D St Clair
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-A2A · Reciprocating · 150
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 63 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind120° @ 5 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO