The guidance material presented in this circular is consistent with and complementary to the comprehensive explanatory circular "The ICAO CNS/ATM Systems: Coping with Air Traffic Demand" and to the "Global Co-ordinated Plan for the Transition to the ICAO CNSIATM Systems", both of which were adopted iri 1993 by the committee charged with developing the framework for introducing the new systems (known as the "FANS Phase II Committee"), were subsequently endorsed by the ICAO Council and are being published as ICAO Circular 251 and ICAO Doc 9629, respectively.

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