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 29, 1991 · Sebly Amateur Built Acro-Sport II Acro-Sport · N391KS
Columbus, KS
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 29, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Columbus, KS
Aircraft
Sebly Amateur Built Acro-Sport II Acro-Sport
Tail Number
N391KS
Operator
Kenneth Frobish
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI91DCQ08
THE PILOT REPORTED THAT WHILE OVERTAKING ANOTHER AIRPLANE INFLIGHT HE CLOSED THE THROTTLE. WHEN HE ADVANCED THE THROTTLE THE ENGINE DID NOT RESPOND. THE AIRPLANE WAS DAMAGED DURING A FORCED LANDING TO A 'LOOSE WORKED BEAN FIELD.' POST ACCIDENT INSPECTION OF THE AIRPLANE AND ENGINE FAILED TO REVEAL THE REASON FOR THE LOSS OF POWER.
NTSB Probable Cause
A LOSS OF ENGINE POWER FOR UNDETERMINED REASONS. A FACTOR ASSOCIATED WITH THE ACCIDENT IS SOFT TERRAIN IN THE FORCED LANDING AREA.
Full Narrative
THE PILOT REPORTED THAT WHILE OVERTAKING ANOTHER AIRPLANE INFLIGHT HE CLOSED THE THROTTLE. WHEN HE ADVANCED THE THROTTLE THE ENGINE DID NOT RESPOND. THE AIRPLANE WAS DAMAGED DURING A FORCED LANDING TO A 'LOOSE WORKED BEAN FIELD.' POST ACCIDENT INSPECTION OF THE AIRPLANE AND ENGINE FAILED TO REVEAL THE REASON FOR THE LOSS OF POWER.
Flight
Event TypeAccident
Event Time12:10 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSebly Amateur Built Acro-Sport II Acro-Sport
Tail NumberN391KS
Aircraft CategoryAir
DamageSubstantial
OperatorKenneth Frobish
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsAvco Lycoming · O-320-D2B · Reciprocating · 160
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 53 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility1 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO