APPENDIX 1. PRINCIPLES GOVERNING THE IDENTIFICATION OF RNP TYPES AND THE IDENTIFICATION OF ATS ROUTES OTHER THAN STANDARD DEPARTURE AND ARRIVAL ROUTES (Chapter 2, Sections 2.7 and 2.11 refer)
Note.— See Appendix 3 concerning the identification of standard departure and arrival routes and associated procedures. Guidance material on the establishment of these routes and procedures is contained in the Air Traffic Services Planning Manual (Doc 9426). 1.
c) be usable by both ground and airborne automation systems; d) permit utmost brevity in operational use; and e) provide sufficient possibility of extension to cater for any future requirements without the need for fundamental changes.
Designators for ATS routes and RNP types
1.1 The purpose of a system of route designators and required navigation performance (RNP) type(s) applicable to specified ATS route segment(s), route(s) or area is to allow both pilots and ATS, taking into account automation requirements: a) to make unambiguous reference to any ATS route without the need to resort to the use of geographical coordinates or other means in order to describe it;
1.3 Controlled, advisory and uncontrolled ATS routes, with the exception of standard arrival and departure routes, shall therefore be identified as specified hereafter.
Composition of designator
2.1 The ATS route designator shall consist of a basic designator supplemented, if necessary, by: a) one prefix as prescribed in 2.3; and
b) to relate an ATS route to a specific vertical structure of the airspace, as applicable;
b) one additional letter as prescribed in 2.4.
c) to indicate a required level of navigation performance accuracy, when operating along an ATS route or within a specified area; and
2.1.1 The number of characters required to compose the designator shall not exceed six characters.
d) to indicate that a route is used primarily or exclusively by certain types of aircraft.
2.1.2 The number of characters required to compose the designator should, whenever possible, be kept to a maximum of five characters.
Note 1.— Prior to the global introduction of RNP, all references in this appendix to RNP also apply to area navigation (RNAV) routes, where navigation performance accuracy requirements have been specified. Note 2.— Specifications governing the publication of RNP types are given in Annex 4, Chapter 7, and Annex 15, Appendix 1.
2.2 The basic designator shall consist of one letter of the alphabet followed by a number from 1 to 999. 2.2.1 Selection of the letter shall be made from those listed hereunder:
Note 3.— In relation to this appendix and for flight planning purposes, a prescribed RNP type is not considered an integral part of the ATS route designator. 1.2 shall:
In order to meet this purpose, the designation system
a) permit the identification of any ATS route in a simple and unique manner;
b) L, M, N, P for area navigation routes which form part of the regional networks of ATS routes; c) H, J, V, W for routes which do not form part of the regional networks of ATS routes and are not area navigation routes; d) Q, T, Y, Z for area navigation routes which do not form part of the regional networks of ATS routes.
b) avoid redundancy; ANNEX 11
a) A, B, G, R for routes which form part of the regional networks of ATS routes and are not area navigation routes;