09/20/10 AC A
(1)
Errors Generated by the Contracting State. Each Sovereign Nation or ICAO Contracting State publishes aeronautical data in support of navigation and other functions. This data frequently contains source origination errors, caused by factors such as survey errors, incorrect association of latitude/longitude
with a fix, or invalid magnetic variation. Errors related to data entry or processing prior to release into the public domain also occur.
(2)
Errors Generated by the Data Service Provider. Companies processing and integrating data from multiple Contracting States can also introduce errors. These errors typically result from the translation process, errors related to data entry or processing, misinterpretation
of the Contracting State data, modifying the Contracting State data to achieve compatibility with the end application, or changing the data format in a manner incompatible with the end application.
(3)
Errors Generated by the Avionics Manufacturer. Errors have occurred due to the processing or use of the data by the avionics manufacturer. Conversion of the data into the final data format has created errors by rendering the data incompatible with implementation assumptions (e.g., incompatible path/terminator
combinations, etc.
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