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 24, 2007 · Robinson R22 BETA II · N147SH
Boise, ID
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
July 24, 2007
Injury Outcomes
2 injuries (2 minor injuries)
Location
Boise, ID
Aircraft
Robinson R22 BETA II
Tail Number
N147SH
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX07CA229
The flight instructor reported that during their fifth practice autorotation, the student let the rotor rpm decay to the point that the certified flight instructor (CFI) attempted to intercede and perform a run on landing. The student and CFI both struggled with each other on the controls until the helicopter hit the ground hard. During the impact sequence, the helicopter spun around, and ultimately came to rest on the left side.
NTSB Probable Cause
The student pilot's failure to maintain rotor rpm resulting in an excessive descent rate and a hard landing. Factors in the accident were the student's failure to relinquish the controls, and the CFI's inadequate supervision.
Full Narrative
The flight instructor reported that during their fifth practice autorotation, the student let the rotor rpm decay to the point that the CFI attempted to intercede and perform a run on landing. The student and CFI both struggled with each other on the controls until the helicopter hit the ground hard. During the impact sequence, the helicopter spun around, and ultimately came to rest on the left side.
Flight
Event TypeAccident
Event Time07:45 PDT
Nearest AirportBoise Air Terminal /Gowen Fld/ (0nm)
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft
AircraftRobinson R22 BETA II
Tail NumberN147SH
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-J2A · Reciprocating · 145
Seats2
People & Injuries
Injury Summary2 injuries (2 minor injuries)
Fatal0
Serious0
Minor2
Uninjured0
Total2
Crew 1Age 30 · Second Class · Minor
Crew 2Age 46 · Second Class · Minor
Conditions
ConditionsVMC
LightDaylight
Wind290° @ 8 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point52
Altimeter29.92 inHg
Observation Time14:54
Weather SourceWFAC