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
January 9, 1993 · Boeing 767-222 · N601UA
Denver, CO
Overview
Report Status
Probable Cause
Event Type
Incident
Date
January 9, 1993
Injury Outcomes
No injuries (208 uninjured)
Location
Denver, CO
Aircraft
Boeing 767-222
Tail Number
N601UA
Operator
United Airlines
Injuries
None
NTSB Number
DEN93IA025
WHILE IN CRUISE FLIGHT EN ROUTE FROM NEWARK, NEW JERSEY, TO SAN FRANCISCO, CALIFORNIA, THE FIRST OFFICER SUFFERED A GRAND MAL SEIZURE AND WAS INCAPABLE OF CONTINUING HIS DUTIES. A COMPANY PILOT RIDING AS A PASSENGER CAME TO THE FLIGHT DECK AND ASSUMED THE FIRST OFFICER'S DUTIES, AND THE AIRCRAFT MADE AN UNEVENTFUL PRECAUTIONARY LANDING IN DENVER, COLORADO, WHERE THE INCAPACITATED FIRST OFFICER WAS REMOVED TO MEDICAL FACILITIES.
NTSB Probable Cause
MEDICAL INCAPACITATION OF THE FIRST OFFICER.
Full Narrative
WHILE IN CRUISE FLIGHT EN ROUTE FROM NEWARK, NEW JERSEY, TO SAN FRANCISCO, CALIFORNIA, THE FIRST OFFICER SUFFERED A GRAND MAL SEIZURE AND WAS INCAPABLE OF CONTINUING HIS DUTIES. A COMPANY PILOT RIDING AS A PASSENGER CAME TO THE FLIGHT DECK AND ASSUMED THE FIRST OFFICER'S DUTIES, AND THE AIRCRAFT MADE AN UNEVENTFUL PRECAUTIONARY LANDING IN DENVER, COLORADO, WHERE THE INCAPACITATED FIRST OFFICER WAS REMOVED TO MEDICAL FACILITIES.
Flight
Event TypeIncident
Event Time19:37 MST
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 767-222
Tail NumberN601UA
Aircraft CategoryAir
OperatorUnited Airlines
Operating RulePart 121
Engines2
Engine TypeUnknown
Engine DetailsNone · N/A · Unknown
Seats217
People & Injuries
Injury SummaryNo injuries (208 uninjured)
Fatal0
Serious0
Minor0
Uninjured208
Total208
Crew 1Age 58 · First Class
Conditions
ConditionsVMC
LightBright Night
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0