PPRuNe Forums - View Single Post - Certification of Robinson Helicopters (incl post by Frank Robinson)
Old 18th Feb 2001, 23:49
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The NTSB website has a query page http://www.ntsb.gov/NTSB/Query.asp which permits the user to search for specific information.

Be sure to set the dates of the field search to 01/01/82 to enable searching the entire database. Also set the results to respond to the maximum number of results per page (100), for ease of reference.

Occasionally listings are classified under different models and do not show up on a general search, so check all model designations appropriate to the model. There are a number of drop down menu's with further information.

The focus of the NTSB site is on accidents occuring to "N" registered aircraft, or aircraft involved in accidents in the US. There are a number of other accidents listed, however.

When reviewing any accident data from this source, it should be remembered that this is raw data with only one relevant statistic - the number of accidents. To make a meaningful interpretation of this information it needs to be factored against flight hours and fleet size, and reviewed in the standard statistical format utilized by the NTSB and FAA.

Otherwise the immediate conclusion would be that the Cessna 150, Bell 206 or Boeing 737 have extraordinarily high accident rates, which is simply not the case. The accident rate smust be compared against the appropriate denominator to ensure the credibility and relevance of the data.