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 3, 1992 · Beech N35 · N1252Z
Delaware, OH
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 3, 1992
Injury Outcomes
1 injury (1 minor injury)
Location
Delaware, OH
Aircraft
Beech N35
Tail Number
N1252Z
Operator
Ronald L Montgomery
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
NYC92LA095
THE BONANZA WAS FOLLOWING AN ARMY AH-1S ON LANDING APPROACH. THE HELICOPTER CROSSED THE THRESHOLD AT APPROX 200 FT AGL AND PLANNED A TOUCHDOWN APPROX 1500 FT FROM THE APPROACH END. WHILE THE HELICOPTER WAS STILL ABOUT 250 FT FROM TOUCHDOWN, THE BONANZA CROSSED THE THRESHOLD AND WAS OBSERVED TO ROLL LEFT AND STRIKE THE GROUND WITH ITS LEFT WING. THE BONANZA CONTINUED ACROSS A TAXIWAY AND CAME REST IN AN AIRCRAFT PARKING AREA. THE HELICOPTER WEIGHED APPROXIMATELY 8400 POUNDS. WHEN INTERVIEWED AFTER THE ACCIDENT, THE BONANZA PILOT SAID HE WAS AWARE OF HELICOPTER WAKE TURBULENCE AND SAID HE THOUGHT THERE WAS SUFFICIENT SEPARATION BETWEEN HIS AIRPLANE AND THE PRECEDING HELICOPTER.
NTSB Probable Cause
A LOSS OF CONTROL IN FLIGHT DUE TO WAKE TUBULENCE FROM A PRECEDING HELICOPTER. A FACTOR RELATED TO THE ACCIDENT WAS THE FAILURE OF THE PILOT TO RECOGINIZE THE HAZARDS OF HIS CLOSE PROXIMITY BEHIND THE LANDING HELICOPTER.
Full Narrative
THE BONANZA WAS FOLLOWING AN ARMY AH-1S ON LANDING APPROACH. THE HELICOPTER CROSSED THE THRESHOLD AT APPROX 200 FT AGL AND PLANNED A TOUCHDOWN APPROX 1500 FT FROM THE APPROACH END. WHILE THE HELICOPTER WAS STILL ABOUT 250 FT FROM TOUCHDOWN, THE BONANZA CROSSED THE THRESHOLD AND WAS OBSERVED TO ROLL LEFT AND STRIKE THE GROUND WITH ITS LEFT WING. THE BONANZA CONTINUED ACROSS A TAXIWAY AND CAME REST IN AN AIRCRAFT PARKING AREA. THE HELICOPTER WEIGHED APPROXIMATELY 8400 POUNDS. WHEN INTERVIEWED AFTER THE ACCIDENT, THE BONANZA PILOT SAID HE WAS AWARE OF HELICOPTER WAKE TURBULENCE AND SAID HE THOUGHT THERE WAS SUFFICIENT SEPARATION BETWEEN HIS AIRPLANE AND THE PRECEDING HELICOPTER.
Flight
Event TypeAccident
Event Time20:03 EDT
Nearest AirportDelaware Municipal (0nm)
Runway1
Runway Length4098 ft
Runway Width75 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech N35
Tail NumberN1252Z
Aircraft CategoryAir
DamageSubstantial
OperatorRonald L Montgomery
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-470 · Reciprocating · 260
Seats4
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 49 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind60° @ 5 kt
Visibility5 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO