This study was written by the analyst staff at the National Aviation Safety Data Analysis Center (NASDAC), which is a part of the Federal Aviation Administrations (FAAs) Office of System Safety (ASY-100). It is presented as an information summary regarding weather turbulence events occurring in the United States between the years 1992 and 2001. Data was extracted from the National Transportation Safety Board (NTSB) Aviation Accident/Incident Data System. The NTSB is the official U.S. repository of aviation accident data and causal factors. The NTSB, an independent Federal Agency not part of the Department of Transportation (DOT), maintains the data. The NTSB database contains information relating to accidents and a small number of incidents, which are not included in this publication. The NTSB defines an accident as an event associated with the operation of an aircraft that takes place between the time any person boards the aircraft with the intention of flight and all such persons have disembarked, and in which any person suffers death or serious injury, or in which the aircraft receives substantial damage. The investigative process can take five or more years to finalize the report, with an average of two to three years. The database includes preliminary, factual, and final reports.


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