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
March 23, 1987 · Mcdonnell Douglas DC-9-82 · N409AA
Minneapolis, MN
Overview
Report Status
Preliminary report
Event Type
Incident
Date
March 23, 1987
Injury Outcomes
No injuries (114 uninjured)
Location
Minneapolis, MN
Aircraft
Mcdonnell Douglas DC-9-82
Tail Number
N409AA
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI87IA100
THE AIRCRAFT LANDED UNEVENTFULLY AFTER THE RIGHT ENGINE FAILED DURING A DESCENT. THE SHUTDOWN OCCURRED AFTER FAILED ANTIROTATION PINS ALLOWED GAS LOADS TO DRIVE NORMALLY STATIONARY THIRD STAGE VANE CLUSTERS IN THE LOW PRESSURE TURBINE AREA. ROTATION OF THE CLUSTERS IN THEIR CHANNEL ALLOWED THE CLUSTERS TO MACHINE THEMSELVES OUT THROUGH THE LOW PRESSURE TURBINE CASE. EVIDENCE INDICATES THAT 23 OF THE 44 THIRD STAGE VANE ANTI-ROTATION PINS RUPTURED FOLLOWED BY FRACTURE OF THE REMAINING PINS FROM SHEAR OVERLOAD. THE PIN STRESS RUPTURE WAS THE RESULT OF BENDING STRESSES ON THE VANE PINS FROM VANE TWIST & PIN MATERIAL CREEP. A DESIGN TASK WAS INITIATED IN 1986 TO PROVIDE A MORE DURABLE PIN AND IN MAY 1987 P&W RELEASED A NEW MATERIAL, INCO 901 NON-STEPPED, ANTI-ROTATION PIN, PN 803995, TO REPLACE THE PN 599714 TINIDUR PIN.
Full Narrative
THE AIRCRAFT LANDED UNEVENTFULLY AFTER THE RIGHT ENGINE FAILED DURING A DESCENT. THE SHUTDOWN OCCURRED AFTER FAILED ANTIROTATION PINS ALLOWED GAS LOADS TO DRIVE NORMALLY STATIONARY THIRD STAGE VANE CLUSTERS IN THE LOW PRESSURE TURBINE AREA. ROTATION OF THE CLUSTERS IN THEIR CHANNEL ALLOWED THE CLUSTERS TO MACHINE THEMSELVES OUT THROUGH THE LOW PRESSURE TURBINE CASE. EVIDENCE INDICATES THAT 23 OF THE 44 THIRD STAGE VANE ANTI-ROTATION PINS RUPTURED FOLLOWED BY FRACTURE OF THE REMAINING PINS FROM SHEAR OVERLOAD. THE PIN STRESS RUPTURE WAS THE RESULT OF BENDING STRESSES ON THE VANE PINS FROM VANE TWIST & PIN MATERIAL CREEP. A DESIGN TASK WAS INITIATED IN 1986 TO PROVIDE A MORE DURABLE PIN AND IN MAY 1987 P&W RELEASED A NEW MATERIAL, INCO 901 NON-STEPPED, ANTI-ROTATION PIN, PN 803995, TO REPLACE THE PN 599714 TINIDUR PIN.
Flight
Event TypeIncident
Event Time09:58 CST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMcdonnell Douglas DC-9-82
Tail NumberN409AA
Aircraft CategoryAir
DamageMinor
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsP&W · JT8D-217 · Turbofan · 20550
Seats125
People & Injuries
Injury SummaryNo injuries (114 uninjured)
Fatal0
Serious0
Minor0
Uninjured114
Total114
Crew 1Age 43 · First Class
Conditions
ConditionsUnknown
LightDaylight
Wind130° @ 13 kt
Visibility8 sm
CeilingOvercast 4600 ft
Temperature / Dew Point46 / 43 C
Altimeter29.00 inHg
Observation Time16:00
Weather SourceWFAC