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
May 24, 1991 · Aero Commander 690C · N81TR
Denver, CO
Overview
Report Status
Preliminary report
Event Type
Incident
Date
May 24, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Denver, CO
Aircraft
Aero Commander 690C
Tail Number
N81TR
Operator
Casper Air Service
Injuries
None
NTSB Number
DEN91IA076
DURING MID-BASE LEG FOR A VFR APPROACH TO LANDING AT STAPELTON INTERNATIONAL AIRPORT, THE PILOT OF N81TR WAS SELECTING FULL FLAP POSITION, WHEN HE HEARD A DULL THUD. THE AIRCRAFT STARTED A ROLL TO THE LEFT, BUT THE PILOT WAS ABLE TO MAINTAIN CONTROL OF THE AIRCRAFT UNITL HE COULD RAISE THE FLAP HANDLE. AFTER SELECTING 'FLAP UP POSITION,' THE AIRCRAFT RETURNED TO NORMAL FLIGHT, AND A NORMAL NO FLAP LANDING WAS ACCOMPLISHED. AFTER LANDING, THE AIRCRAFT WAS PARKED AND INSPECTED. A BROKEN FLAP CABLE WAS FOUND. LATER, TESTS REVEALED THE CABLE HAD SEPARATED DUE TO FATIGUE.
Full Narrative
DURING MID-BASE LEG FOR A VFR APPROACH TO LANDING AT STAPELTON INTERNATIONAL AIRPORT, THE PILOT OF N81TR WAS SELECTING FULL FLAP POSITION, WHEN HE HEARD A DULL THUD. THE AIRCRAFT STARTED A ROLL TO THE LEFT, BUT THE PILOT WAS ABLE TO MAINTAIN CONTROL OF THE AIRCRAFT UNITL HE COULD RAISE THE FLAP HANDLE. AFTER SELECTING 'FLAP UP POSITION,' THE AIRCRAFT RETURNED TO NORMAL FLIGHT, AND A NORMAL NO FLAP LANDING WAS ACCOMPLISHED. AFTER LANDING, THE AIRCRAFT WAS PARKED AND INSPECTED. A BROKEN FLAP CABLE WAS FOUND. LATER, TESTS REVEALED THE CABLE HAD SEPARATED DUE TO FATIGUE.
Flight
Event TypeIncident
Event Time20:25 MDT
Nearest AirportStapleton International (0nm N)
Runway18
Runway Length7700 ft
Runway Width150 ft
Flight Plan FiledUnknown
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAero Commander 690C
Tail NumberN81TR
Aircraft CategoryAir
OperatorCasper Air Service
Operating RulePart 135
Engines2
Engine TypeTurboprop
Engine DetailsGarrett · TPE331-5-254K · Turboprop · 717
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 35 · First Class
Conditions
ConditionsVMC
LightDusk
Wind180° @ 5 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourceWIT