4.1.5 Regional Routes and Non-Regional Routes
4.1.5.1 Where international operations constitute the majority of the traffic, the development of the ATS route network requires a cohesive and co-ordinated behaviour of all States concerned. Where national operations constitute the bulk of the traffic to be handled, there is still a need for a concerted approach with adjacent States.
4.1.5.2 Isolated actions by States in developing a national ATS route network are only possible with respect to ATS routes serving strictly national purposes. Such action will, in most cases, have direct and noticeable effects on the traffic beyond the area of responsibility of the States concerned.
4.1.5.3 In this context, following the ICAO European Region initiative and the ECAC en-route Strategy for the 1990’s, a Route Network Development Sub-Group (RNDSG) under the auspices of the EUROCONTROL Airspace & Navigation Team (ANT) was created in May 1993 to act as the organiser and co-ordinator of planning and implementation activities aimed at improving and upgrading the ATS Route Network in the ECAC area of the European Region as mandated by ICAO (EANPG Conclusions 35/2 & 36/2).
4.1.5.4 All ECAC States are required to actively participate to this international work as the detailed establishment or review of individual ATS routes, forming the ATS route network, should now definitely proceed through the RNDSG from a “Top Down” approach taking an ECAC-wide view, based upon the need for enhancement of overall ECAC ATM capacity along the following lines :
a) First identify the foreseen major traffic flows within the ECAC area as well as those extending beyond and review the weak links in the current route and sector organisation;
b) Establish and review the Regional En-route Network and supporting sectorisation to accommodate the expected major traffic flows reducing the airspace structures complexity and balancing the ATC workload;
c) Integrate those routes required to provide access to the Regional En-route Network from and to locations not directly served by them, as well as those routes not permanently available required to alleviate the traffic load on the main ATS routes (e.g. Conditional Routes);
8 States may still designate Non-RNAV routes outside the Regional ATS Route Network as available for aircraft not fitted with RNAV equipment
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d) Ensure connectivity between the en-route network and routes to/from Terminal Airspace;
e) Establish an overall phased implementation programme to ensure consistency in individual State implementation.
4.1.5.5 States may still designate Non-Regional routes to satisfy those activities of a more local nature or of a specific user group (e.g. VFR routes, military low-level routes, night flying,..) and should determine if these local routes need to be integrated in the overall route network.
4.1.6 Lower ATS Routes and Upper ATS Routes
4.1.6.1 In the ICAO EUR Air Navigation Plan (Doc. 7754, Vol.I, Basic ANP – Table ATS-1), the description of the ATS route network is subdivided, for planning purposes, into Lower and Upper ATS Routes with a uniform plane of division established at FL 245 disregarding existing limits of the FIRS/UIRs in the EUR region.
4.1.6.2 In the present environment, however, the division between Upper and Lower airspace has no relevance for most of the ECAC Region. But, national publication of ATS routes in AIPs are still distinguishing Lower and Upper ATS routes from a national perspective adopting their own FIR/UIR division without considering adjacent vertical division.
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