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
September 17, 1984 · Aerospatiale SA315B LAMA SA315B LAM · N49532
Mountain View, WY
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 17, 1984
Injury Outcomes
No injuries (1 uninjured)
Location
Mountain View, WY
Aircraft
Aerospatiale SA315B LAMA SA315B LAM
Tail Number
N49532
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN84LA292
THE HELICOPTER EXPERIENCED A LOSS OF POWER DURING AN EXTERNAL LOAD OPERATION. THE PLT RELEASED THE LOAD AND PERFORMED AN AUTOROTATION. A HARD LANDING RESULTED DURING WHICH THE TAIL BOOM WAS SEVERED BY THE MAIN ROTOR BLADES. METALLURGICAL EXAMINATION OF THE ENGINE COMPRESSOR SECTION REVEALED THE REAR 1/3 OF THE #3 COMPRESSOR BLADE SEPARATED FROM THE ASS'Y BY A TRANSVERSE FRACTURE THROUGH THE PLATFORM AND AIRFOIL. THE #5 ATTACHMENT PIN SEPARATED APRX 1/4 INCH FROM ITS AFT SURFACE. THE FRACTURE OCCURRED DUE TO A COMBINATION OF STRESS CORROSION CRACKING, FATIGUE PROGRESSION AND BENDING OVERSTRESS.
Full Narrative
THE HELICOPTER EXPERIENCED A LOSS OF POWER DURING AN EXTERNAL LOAD OPERATION. THE PLT RELEASED THE LOAD AND PERFORMED AN AUTOROTATION. A HARD LANDING RESULTED DURING WHICH THE TAIL BOOM WAS SEVERED BY THE MAIN ROTOR BLADES. METALLURGICAL EXAMINATION OF THE ENGINE COMPRESSOR SECTION REVEALED THE REAR 1/3 OF THE #3 COMPRESSOR BLADE SEPARATED FROM THE ASS'Y BY A TRANSVERSE FRACTURE THROUGH THE PLATFORM AND AIRFOIL. THE #5 ATTACHMENT PIN SEPARATED APRX 1/4 INCH FROM ITS AFT SURFACE. THE FRACTURE OCCURRED DUE TO A COMBINATION OF STRESS CORROSION CRACKING, FATIGUE PROGRESSION AND BENDING OVERSTRESS.
Flight
Event TypeAccident
Event Time10:35 MDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAerospatiale SA315B LAMA SA315B LAM
Tail NumberN49532
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsTurbomeca · ARTOUSTE IIIB · Turboshaft · 562
Seats6
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 35 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind240° @ 5 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point63 F / 46
Altimeter0
Weather SourcePILO