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Purpose of This Notice. This notice provides revised guidance for Federal Aviation Administration (FAA) certificate-holding district offices (CHDO) and principal operations inspectors (POI) assigned to operators conducting airplane operations under Title 14 of the Code of Federal Regulations (14 CFR) parts 91, 91K, 121, 125 (including the Letter of Deviation Authority (LODA) A125 operators), and 135. This notice introduces all A353 templates (i.e., operations specification (OpSpec) A353, management specification (MSpec) A353, and letter of authorization (LOA) A353) for operators conducting airplane operations under parts 91, 91K, 121, 125 (including the LODA A125 operators), and 135, to allow the use of Automatic Dependent Surveillance-Broadcast (ADS-B) equipment in Canadian airspace for air traffic separation of participating aircraft.