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4.1.9.2  From this guidance material, reductions of the B-RNAV9 Route spacing minimum, to somewhere in the order of 10-15 NM, are expected to be possible for the ATS Route Network by placing higher reliance on ATC Radar Monitoring and intervention capabilities.
4.1.9.3  The circumstances in which such a reduction of route spacing is applied, will need to be assessed on case by case basis in accordance with ICAO Doc. 9689, taking into consideration procedural or radar environments and associated controller workload. An example study will be outlined in the ICAO EUR Guidance Material.
9  B-RNAV is specified as a navigation performance requiring a track-keeping accuracy of +/- 5NM for 95% of the flight time (see Chapter 4.1.4 above)
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4.1.10  Amendment to ICAO EUR ANP and Phased Implementation Plan
4.1.10.1  The ICAO European Region Air Navigation Plan (Doc. 7754 - EUR ANP) presents in general terms the ICAO plan for the provision of facilities and services for international air navigation in the ICAO European region. The Vol.1 -EUR Basic ANP describes in particular the basic ATS route network in the lower and upper airspace of the EUR region in the form of tables and charts artificially split at FL 245.
4.1.10.2  In order to be consistent with current and foreseen requirements of international civil aviation, the table and charts ATS-1 “Basic ATS route network in the Lower and Upper Airspace” of the ICAO Doc. 7754 are regularly updated to reflect ECAC States agreement to implement a new ARN version established by the RNDSG.
4.1.10.3  However, due to the time constraints of the ICAO EUR ANP amendment process and in order to have a more accurate view of the status of implementation of a new agreed ARN version, the RNDSG is required to establish a common programme for a phased implementation of the new version of the ATS Route Network and associated sectorisation indicating intermediate evolutionary stages and appropriate target dates.

4.1.11  Harmonised Publication of ATS Routes
4.1.11.1  The ICAO AIS Manual (Doc. 8126) recommends that AIP - Part ENR 3 contains a list of all ATS routes established within the territory covered by the AIP, whether they form part of ICAO regional air navigation agreements or are for use by domestic traffic only.
4.1.11.2  As specified in Doc. 8126 – Appendix H (ENR 3. ATS Routes), a description should be included, where applicable, of the route(s), or portion(s) thereof, where special procedures are required. Additionally, an indication of the special procedures concerned should be given. Information relating to upper ATS routes should normally be listed separately in ENR 3.2.
4.1.11.3  In these circumstances, Permanent ATS routes and Conditional Routes (CDRs) should be listed together in so far as a single ATS route could contain both a permanent route portion and one or more segments of different categories of CDRs. Thus, there is no need to have additional designators for CDRs (see Chapter 4.4).

4.2  ATS ROUTE NETWORK DEVELOPMENT
4.2.1 General Approach
4.2.1.1  Since 1993 under the auspices of the Airspace & Navigation Team (ANT), the Route Network Development Sub-Group (RNDSG) has developed a planning process for versions of the ATS Route Network (ARN) which is “Top Down” and utilises a number of facilitating concepts and planning techniques which are described in the following sections.

4.2.2  A “Top Down” Approach
4.2.2.1  In developing versions of the ARN, the RNDSG has, as already mentioned, adopted a “Top Down” Approach which takes an ECAC wide view and is based upon the need for enhancement of overall ECAC ATM capacity.  The process includes progression from broad proposals towards specific solutions.
Edition: 2.0 Released Issue  Page 4-5
Step 1 -Starting from in-depth analysis to identify current and foreseen problems,
　
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