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
July 1, 1991 · Bell UH-1B · N91348
Iaeger, WV
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 1, 1991
Injury Outcomes
1 injury (1 minor injury)
Location
Iaeger, WV
Aircraft
Bell UH-1B
Tail Number
N91348
Operator
Ranger Helicopter Service
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
BFO91DOA01
THE PILOT WAS DOING AN AERIAL SPRAY OF A WOODED AREA WHEN THE LOW RPM WARNING SOUNDED. HE THEN NOTICED THE ROTOR/ENGINE RPM READING WAS DECREASING RAPIDLY. THE PILOT DID AN AUTOROTATION DESCENT. DURING THE LANDING THE ACFT STRUCK TREES AND THEN IMPACTED THE GROUND. THE ACFT CAME TO REST ON ITS LEFT SIDE. THE EXAMINATION OF THE ACFT DID NOT DISCLOSE EVIDENCE OF MECHANICAL MALFUNCTION.
NTSB Probable Cause
THE LOSS OF ENGINE POWER FOR UNDETERMINED REASONS, WHILE OPERATING OVER UNSUITABLE TERRAIN.
Full Narrative
THE PILOT WAS DOING AN AERIAL SPRAY OF A WOODED AREA WHEN THE LOW RPM WARNING SOUNDED. HE THEN NOTICED THE ROTOR/ENGINE RPM READING WAS DECREASING RAPIDLY. THE PILOT DID AN AUTOROTATION DESCENT. DURING THE LANDING THE ACFT STRUCK TREES AND THEN IMPACTED THE GROUND. THE ACFT CAME TO REST ON ITS LEFT SIDE. THE EXAMINATION OF THE ACFT DID NOT DISCLOSE EVIDENCE OF MECHANICAL MALFUNCTION.
Flight
Event TypeAccident
Event Time11:30 EDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell UH-1B
Tail NumberN91348
Aircraft CategoryHeli
DamageSubstantial
OperatorRanger Helicopter Service
Operating RulePart 137
Engines1
Engine TypeTurboshaft
Engine DetailsLycoming · T53-L-11-D · Turboshaft · 1100
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 25 · None
Conditions
ConditionsVMC
LightDaylight
Wind250°
Visibility5 sm
CeilingBroken clouds 1900 ft
Temperature / Dew Point1 C
Altimeter29.00 inHg
Observation Time15:00
Weather SourceWFAC