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 5, 1991 · Robinson R22B · N91MG
Mineral, IL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 5, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Mineral, IL
Aircraft
Robinson R22B
Tail Number
N91MG
Operator
Darrell L Marquis
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI91DEE06
A COMMERICAL PILOT APPLYING CHEMICAL SPRAY TO A CORN FIELD REVERSED COURSE FOR A DOWNWIND PASS. A POWER LINE BORDERED THE NEAR END OF THE FIELD AND THE PILOT ATTEMPTED TO DROP JUST OVER THE LINE TO COMMENCE THE RUN. THE TAIL ROTOR STRUCK THE POWER LINE, SHEARING BOTH TAIL ROTOR BLADES CLOSE TO THE HUB. THE PILOT REDUCED POWER AND CONTINUED THE DESCENT TO A HARD LANDING WITH NO TORQUE CONTROL.
NTSB Probable Cause
FAILURE OF THE PILOT TO MAINTAIN CLEARANCE FROM THE POWER LINE.
Full Narrative
A COMMERICAL PILOT APPLYING CHEMICAL SPRAY TO A CORN FIELD REVERSED COURSE FOR A DOWNWIND PASS. A POWER LINE BORDERED THE NEAR END OF THE FIELD AND THE PILOT ATTEMPTED TO DROP JUST OVER THE LINE TO COMMENCE THE RUN. THE TAIL ROTOR STRUCK THE POWER LINE, SHEARING BOTH TAIL ROTOR BLADES CLOSE TO THE HUB. THE PILOT REDUCED POWER AND CONTINUED THE DESCENT TO A HARD LANDING WITH NO TORQUE CONTROL.
Flight
Event TypeAccident
Event Time11:00 CDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRobinson R22B
Tail NumberN91MG
Aircraft CategoryHeli
DamageSubstantial
OperatorDarrell L Marquis
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320 · Reciprocating · 160
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 35 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind80° @ 10 kt, gusting 12 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point70 F
Altimeter29.00 inHg
Weather SourcePILO