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
November 2, 1992 · Raven AX-9 · N57139
Green River, UT
Overview
Report Status
Probable Cause
Event Type
Accident
Date
November 2, 1992
Injury Outcomes
5 injuries (4 serious injuries, 1 minor injury)
Location
Green River, UT
Aircraft
Raven AX-9
Tail Number
N57139
Operator
Markle John R
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
SEA93LA017
THE PILOT TOOK OFF FROM A REMOTE SITE WITHOUT OBTAINING A WEATHER BRIEFING, ENCOUNTERED FCST TURB DURING THE INITIAL CLIMB, WHICH PITCHED THE BALLOON INTO AN UNUSUAL ATTITUDE AND PARTIALLY DEFLATED THE ENVELOPE. THE PILOT INITIATED AN EMERGENCY FORCED LANDING, ACTIVATED THE DEFLATION LINE AT 40 FT. AGL, AND THE BASKET IMPACTED THE GROUND AT 400 TO 600 FPM. AN ADVISORY WAS IN EFFECT FOR OCNL MDT TO ISOLD SVR TURB.
NTSB Probable Cause
THE INADEQUATE PREFLT PLANNING/PREPARATION BY THE PILOT RESULTING IN INFLT ENCOUNTER WITH WEATHER AND HIS FAILURE TO MAINTAIN PROPER RATE OF DESCENT DURING AN EMERGENCY FORCED LANDING. A FACTOR RELATING TO THE ACCIDENT WAS THE TURBULENT WEATHER CONDITIONS.
Full Narrative
THE PILOT TOOK OFF FROM A REMOTE SITE WITHOUT OBTAINING A WEATHER BRIEFING, ENCOUNTERED FCST TURB DURING THE INITIAL CLIMB, WHICH PITCHED THE BALLOON INTO AN UNUSUAL ATTITUDE AND PARTIALLY DEFLATED THE ENVELOPE. THE PILOT INITIATED AN EMERGENCY FORCED LANDING, ACTIVATED THE DEFLATION LINE AT 40 FT. AGL, AND THE BASKET IMPACTED THE GROUND AT 400 TO 600 FPM. AN ADVISORY WAS IN EFFECT FOR OCNL MDT TO ISOLD SVR TURB.
Flight
Event TypeAccident
Event Time09:00 MST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRaven AX-9
Tail NumberN57139
Aircraft CategoryBall
DamageSubstantial
OperatorMarkle John R
Operating RulePart 91
Engines0
Engine TypeUnknown
Engine DetailsUnknown
Seats0
People & Injuries
Injury Summary5 injuries (4 serious injuries, 1 minor injury)
Fatal0
Serious4
Minor1
Uninjured0
Total5
Crew 1Age 39 · None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility60 sm
CeilingBroken clouds 8000 ft
Temperature / Dew Point34 C / 28 C
Altimeter29.00 inHg
Observation Time14:35
Weather SourceWFAC