FTW94LA229
1994-07-07 · SOUTH BEND, Indiana, United States · Serious · 1 aircraft · Status: Completed
Aircraft involved
Probable cause & findings
THE ENCOUNTER WITH UNFORCASTED AND UNREPORTED TURBULENCE.
Factual narrative
On July 7, 1994, at 1659 central daylight time, a Boeing 737-2H4, N60SW, encountered moderate turbulence near South Bend, Indiana. One flight attendant was seriously injured. Four crew members and 100 passengers were not injured. Instrument meteorological conditions (IMC) prevailed for Southwest Airlines Flight 1490, scheduled Title 14 CFR Part 121 flight to Cleveland-Hopkins International (CLE) Airport, Ohio. According to the pilot/operator report, radar was used to avoid weather as the aircraft approached South Bend, Indiana. There had been no pilot reports of turbulence and the company dispatcher weather package did not report turbulence. As the flight climbed through FL200, moderate turbulence was encountered for several seconds. The aircraft then entered visual meteorological conditions and smooth air. The captain stated that the unexpected turbulence started and stopped so quickly that he did not have time to warn the flight attendants. A flight attendant in the aft galley fell to the floor injuring her back. A paramedic on the flight assisted the flight attendant. The seat belt sign was illuminated at the time the turbulence was encountered. The captain made the decision to continue to their destination because the weather they had passed through was getting worse, and the flight attendant's injury was not thought to be severe. As the flight approached Cleveland (CLE) thunderstorms were developing over the airport causing landing delays, so the flight was diverted to Detroit Metropolitan Wayne County Airport, Detroit, Michigan. Paramedics met the airplane at the gate and transported the flight attendant to the hospital. A FLIGHT ATTENDANT WORKING IN THE AFT GALLEY FELL TO THE FLOOR SERIOUSLY INJURING HER BACK WHEN THE AIRCRAFT ENCOUNTERED TURBULENCE. ACCORDING TO THE FLIGHT CREW, RADAR WAS USED TO AVOID WEATHER AS THE AIRCRAFT APPROACHED SOUTH BEND, INDIANA. THERE HAD BEEN NO PILOT REPORTS OF TURBULENCE, AND THE COMPANY DISPATCHER WEATHER PACKAGE DID NOT REPORT TURBULENCE. AS THE FLIGHT CLIMBED THROUGH FL200, MODERATE TURBULENCE WAS ENCOUNTERED FOR SEVERAL SECONDS. THE AIRCRAFT THEN ENTERED VISUAL METEOROLOGICAL CONDITIONS AND SMOOTH AIR. THE CAPTAIN STATED THAT THE UNEXPECTED TURBULENCE STARTED AND STOPPED SO QUICKLY THAT HE DID NOT HAVE TIME TO WARN THE FLIGHT ATTENDANTS. THE SEAT BELT SIGN WAS ILLUMINATED AT THE TIME THE TURBULENCE WAS ENCOUNTERED. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1994_FTW94LA229.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
Matched on aircraft type or causal vocabulary (imc, turbulence, thunderstorm). All research papers
- NASA NTRS 2019 · Contractor Report (CR) An Examination of Aviation Accidents Associated with Turbulence, Wind Shear and Thunderstorm
The focal point of the study reported here was the definition and examination of turbulence, wind shear and thunderstorm in relation to aviation accidents.
- NASA NTRS 2019 · Reprint (Version printed in journal) Observations of severe turbulence near thunderstorm tops
Data derived from the flight tapes of two airliners that experienced severe turbulence near thunderstorm tops are used to produce quantitative descriptions of the turbulence and its environment.
- NASA NTRS 2019 · Conference Proceedings Operational evaluation of thunderstorm penetration test flights during project Storm Hazards '80
The National Aeronautics and Space Administration is conducting a research project called Storm Hazards '80 in order to study the prediction, detectability and avoidance of the hazards of severe storm…
- NASA NTRS 2019 · Reprint (Version printed in journal) Severe Turbulence and Maneuvering from Airline Flight Records
Digital flight records from reported clear-air turbulence incidents are used to determine winds and turbulence, to determine maneuver g loads, and to analyze control problems.
- arXiv 2026 · arXiv preprint Direct Numerical Simulations of Ice-Ocean Boundary Turbulence
Turbulent heat and freshwater transport at ice-ocean interfaces controls glacier and iceberg melt rates, yet the underlying physics remains poorly constrained.
- arXiv 2025 · arXiv preprint Explainable LiDAR 3D Point Cloud Segmentation and Clustering for Detecting Airplane-Generated Wind Turbulence
Wake vortices - strong, coherent air turbulences created by aircraft - pose a significant risk to aviation safety and therefore require accurate and reliable detection methods.