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
May 18, 1984 · Cessna P210N · N4772K
Ramona, CA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
May 18, 1984
Injury Outcomes
1 injury (1 minor injury)
Location
Ramona, CA
Aircraft
Cessna P210N
Tail Number
N4772K
Operator
Advance Aircraft
Injuries
Minor
Aircraft Damage
Destroyed
NTSB Number
LAX84LA298
AS PART OF AN EXPERIMENTAL TEST FLT IN THE TURBINE POWERED ACFT, INTENTIONAL SPINS WERE PERFORMED. THE PLANNED ONE TURN SPIN EVOLVED INTO A FLAT SPIN. RECOVERY PROCEDURES WERE INEFFECTIVE AND THE PLT ELECTED TO DEPLOY THE ANTI-SPIN PARACHUTE. DESPITE REPEATED EFFORTS BY THE PILOT, THE ANTI-SPIN PARACHUTE WOULD NOT OPEN. DESCENDING OUT OF CONTROL THROUGH 7000 FT, THE PLT SUCCESSFULLY EGRESSED FROM THE ACFT & PARACHUTED SAFELY TO THE GROUND.
Full Narrative
AS PART OF AN EXPERIMENTAL TEST FLT IN THE TURBINE POWERED ACFT, INTENTIONAL SPINS WERE PERFORMED. THE PLANNED ONE TURN SPIN EVOLVED INTO A FLAT SPIN. RECOVERY PROCEDURES WERE INEFFECTIVE AND THE PLT ELECTED TO DEPLOY THE ANTI-SPIN PARACHUTE. DESPITE REPEATED EFFORTS BY THE PILOT, THE ANTI-SPIN PARACHUTE WOULD NOT OPEN. DESCENDING OUT OF CONTROL THROUGH 7000 FT, THE PLT SUCCESSFULLY EGRESSED FROM THE ACFT & PARACHUTED SAFELY TO THE GROUND.
Flight
Event TypeAccident
Event Time11:45 PDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna P210N
Tail NumberN4772K
Aircraft CategoryAir
DamageDestroyed
OperatorAdvance Aircraft
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsP&W · PT6A-135 · Reciprocating · 750
Seats1
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 63 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 2 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO