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
June 11, 1983 · Bell 47G-2 · N41721
Zillah, WA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
June 11, 1983
Injury Outcomes
No injuries (1 uninjured)
Location
Zillah, WA
Aircraft
Bell 47G-2
Tail Number
N41721
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA83LA122
THE ROTORCRAFT MADE A HARD LANDING AFTER COLLIDING WITH TREES DURING AN AUTOROTATION. THE ACFT HAD EXPERIENCED AN ENGINEFAILURE WHILE ON A REPOSITIONING FLIGHT BETWEEN AERIAL APPLICATION OPERATIONS AND WAS FORCED TO LAND. THE ACFT WAS AUTOROTATED INTO AN ORCHARD AND CONTACTED TREES, SUSTAINING SUBTANTIAL DAMAGE TO THE SKIDS, MAIN ROTOR BLADES AND TAIL BOOM. THE PILOT WAS UNINJURED. THE FLIGHT ORIGINATED FROM A TEMPORARY SITE A FEW MINUTES BEFORE THE MISHAP. INVESTIGATION REVEALED THE POWER LOSS WAS DUE TO FUEL EXHAUSTION. THE FUEL CELLS WERE EMPTY BUT THE FUEL GAUGES SHOWED FUEL REMAINING. THE ACFT WAS FUELED WITH 22 GALLONS OF FUEL.THE GAUGES READ ONE QUARTER-LEFT,ONE HALF-RIGHT. THE SYSTEM WAS DRAINED EMPTY. THE GAUGES READ ONE EIGHTH-LEFT,ONE QUARTER-RIGHT.
Full Narrative
THE ROTORCRAFT MADE A HARD LANDING AFTER COLLIDING WITH TREES DURING AN AUTOROTATION. THE ACFT HAD EXPERIENCED AN ENGINEFAILURE WHILE ON A REPOSITIONING FLIGHT BETWEEN AERIAL APPLICATION OPERATIONS AND WAS FORCED TO LAND. THE ACFT WAS AUTOROTATED INTO AN ORCHARD AND CONTACTED TREES, SUSTAINING SUBTANTIAL DAMAGE TO THE SKIDS, MAIN ROTOR BLADES AND TAIL BOOM. THE PILOT WAS UNINJURED. THE FLIGHT ORIGINATED FROM A TEMPORARY SITE A FEW MINUTES BEFORE THE MISHAP. INVESTIGATION REVEALED THE POWER LOSS WAS DUE TO FUEL EXHAUSTION. THE FUEL CELLS WERE EMPTY BUT THE FUEL GAUGES SHOWED FUEL REMAINING. THE ACFT WAS FUELED WITH 22 GALLONS OF FUEL.THE GAUGES READ ONE QUARTER-LEFT,ONE HALF-RIGHT. THE SYSTEM WAS DRAINED EMPTY. THE GAUGES READ ONE EIGHTH-LEFT,ONE QUARTER-RIGHT.
Flight
Event TypeAccident
Event Time12:50 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G-2
Tail NumberN41721
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · VO-435 · Reciprocating · 260
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 36 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind210° @ 5 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point64 F / 37 C
Altimeter29.00 inHg
Observation Time20:00
Weather SourceWFAC