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 8, 1990 · Grumman-Schweizer G-164B · N6725K
Buttonwillow, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 8, 1990
Injury Outcomes
1 injury (1 serious injury), 1 unknown outcome
Location
Buttonwillow, CA
Aircraft
Grumman-Schweizer G-164B
Tail Number
N6725K
Operator
Vince Crop Duster
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
LAX90DVA04
THE PILOT WAS COMPLETEING AN AERIAL APPLICATION SWATH RUN, WHEN HE HEARD A LOUD BACKFIRE EMANATE FROM THE ENGINE DURING THE PULL-UP. THE ENGINE THEN QUIT RUNNING ALTOGETHER. THE PILOT ATTEMPTED TO MAKE A LANDING ON A DIRT ROAD, BUT LANDED SHORT IN A TOMATO FIELD, AND THE AIRCRAFT NOSED OVER ONTO ITS BACK. EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER 7 CYLINDER HEAD HAD A CRACK, WHICH EXTENDED FROM THE FORWARD SPARK PLUG BOSS AROUND THE CYLINDER HEAD TO THE REAR SPARK PLUG BOSS. DETAILED EXAMINATION OF THE CRACK SHOWED THAT THE FRACTURE FACE WAS CONTAMINATED BY CARBON DEPOSITS AND LIGHT CORROSION IN THE COARSE AREA OF THE CRACK, INDICATING THAT THE CRACK WAS PRESENT FOR A LENGTHY PERIOD OF TIME PRIOR TO THE ACCIDENT. THE CYLINDER WAS REPORTED TO HAVE ONLY 181 HOURS SINCE OVERHAUL.
NTSB Probable Cause
FAILURE OF THE #7 CYLINDER DUE TO A PRE-EXISTING CRACK. THE TERRAIN CONDITION WAS A RELATED FACTOR.
Full Narrative
THE PILOT WAS COMPLETEING AN AERIAL APPLICATION SWATH RUN, WHEN HE HEARD A LOUD BACKFIRE EMANATE FROM THE ENGINE DURING THE PULL-UP. THE ENGINE THEN QUIT RUNNING ALTOGETHER. THE PILOT ATTEMPTED TO MAKE A LANDING ON A DIRT ROAD, BUT LANDED SHORT IN A TOMATO FIELD, AND THE AIRCRAFT NOSED OVER ONTO ITS BACK. EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER 7 CYLINDER HEAD HAD A CRACK, WHICH EXTENDED FROM THE FORWARD SPARK PLUG BOSS AROUND THE CYLINDER HEAD TO THE REAR SPARK PLUG BOSS. DETAILED EXAMINATION OF THE CRACK SHOWED THAT THE FRACTURE FACE WAS CONTAMINATED BY CARBON DEPOSITS AND LIGHT CORROSION IN THE COARSE AREA OF THE CRACK, INDICATING THAT THE CRACK WAS PRESENT FOR A LENGTHY PERIOD OF TIME PRIOR TO THE ACCIDENT. THE CYLINDER WAS REPORTED TO HAVE ONLY 181 HOURS SINCE OVERHAUL.
Flight
Event TypeAccident
Event Time06:30 PDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftGrumman-Schweizer G-164B
Tail NumberN6725K
Aircraft CategoryAir
DamageDestroyed
OperatorVince Crop Duster
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-1340-AN-1 · Reciprocating · 600
Seats1
People & Injuries
Injury Summary1 injury (1 serious injury), 1 unknown outcome
Fatal0
Serious1
Minor0
Uninjured0
Total2
Crew 1Age 55 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind140° @ 5 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point70 F / 59
Altimeter29.00 inHg
Observation Time12:55
Weather SourceWFAC