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
August 31, 1992 · Saab-Scania Ab Saab 340B · N245AE
Chattanooga, TN
Overview
Report Status
Probable Cause
Event Type
Incident
Date
August 31, 1992
Injury Outcomes
No injuries (25 uninjured)
Location
Chattanooga, TN
Aircraft
Saab-Scania Ab Saab 340B
Tail Number
N245AE
Operator
Flagship Airlines
Injuries
None
NTSB Number
ATL92IA169
THE FLIGHT WAS CRUISING AT AN ALTITUDE OF 15,000 FEET. THE FLIGHT CREW OBSERVED THE PROPELLER OIL PRESSURE FOR THE LEFT ENGINE RISE ABOVE THE RED LINE, AND SHUT THE ENGINE DOWN. THE FLIGHT WAS OVER CHATTANOOGA, TENNESSEE, AND THE PILOT ELECTED TO LAND AT CHATTANOOGA. THE FLIGHT CREW UNSUCCESSFULLY ATTEMPTED SEVERAL TIMES TO FEATHER THE PROPELLER. THE FLIGHT CREW REPORTED THAT AT SOME POINT, PRIOR TO EXITING THE RUNWAY AFTER LANDING, THE AIRCRAFT PROPELLER HAD STOPPED ROTATING. EXAMINATION OF THE PROPELLER GEAR BOX REVEALED THAT THE GEAR BOX WAS SEIZED AS A RESULT OF A FAILURE WITHIN THE GEAR BOX. EXAMINATION OF THE PROPELLER CONTROL UNIT REVEALED THAT THE UNIT WAS FAILED TO PITCHLOCK AS A RESULT OF CONTAMINATED OIL SUPPLY FROM THE GEAR BOX. VELOCITY MINIMUM CONTROL WITH A NON ROTATING PROPELLER HAS NOT BEEN DETERMINED FOR THIS AIRCRAFT.
NTSB Probable Cause
THE FAILURE AND SUBSEQUENT SEIZURE OF THE REDUCTION GEAR BOX, AND THE FAILURE OF THE PROPELLER CONTROL UNIT AS A RESULT OF CONTAMINATED OIL SUPPLY WHICH IS SHARED WITH THE GEAR BOX.
Full Narrative
THE FLIGHT WAS CRUISING AT AN ALTITUDE OF 15,000 FEET. THE FLIGHT CREW OBSERVED THE PROPELLER OIL PRESSURE FOR THE LEFT ENGINE RISE ABOVE THE RED LINE, AND SHUT THE ENGINE DOWN. THE FLIGHT WAS OVER CHATTANOOGA, TENNESSEE, AND THE PILOT ELECTED TO LAND AT CHATTANOOGA. THE FLIGHT CREW UNSUCCESSFULLY ATTEMPTED SEVERAL TIMES TO FEATHER THE PROPELLER. THE FLIGHT CREW REPORTED THAT AT SOME POINT, PRIOR TO EXITING THE RUNWAY AFTER LANDING, THE AIRCRAFT PROPELLER HAD STOPPED ROTATING. EXAMINATION OF THE PROPELLER GEAR BOX REVEALED THAT THE GEAR BOX WAS SEIZED AS A RESULT OF A FAILURE WITHIN THE GEAR BOX. EXAMINATION OF THE PROPELLER CONTROL UNIT REVEALED THAT THE UNIT WAS FAILED TO PITCHLOCK AS A RESULT OF CONTAMINATED OIL SUPPLY FROM THE GEAR BOX. VELOCITY MINIMUM CONTROL WITH A NON ROTATING PROPELLER HAS NOT BEEN DETERMINED FOR THIS AIRCRAFT.
Flight
Event TypeIncident
Event Time15:50 EDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSaab-Scania Ab Saab 340B
Tail NumberN245AE
Aircraft CategoryAir
OperatorFlagship Airlines
Operating RulePart 121
Engines2
Engine TypeTurboprop
Engine DetailsGe · CT7-9B · Turboprop · 1750
Seats37
People & Injuries
Injury SummaryNo injuries (25 uninjured)
Fatal0
Serious0
Minor0
Uninjured25
Total25
Crew 1Age 42 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind70° @ 4 kt
Visibility10 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point66 F
Altimeter30.00 inHg
Observation Time19:50
Weather SourceWFAC