scope:

The first volume of this document is the basic air navigation plan. It contains general planning criteria, implementation guidelines and stable plan elements. The second volume, the facilities and services implementation document (FASID) sets forth in general terms the facilities, services and procedures required for international air navigation within a specified area. This FASID contains specifications which governments can follow in programming the provision of their air navigation facilities and services, with the assurance that facilities and services furnished in accordance with the basic pian will form with those of other States an integrated system adequate for the foreseeable future.