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coordinates or other means in order to describe it;
b) to relate an ATS route to a specific vertical structure of
the airspace, as applicable;
c) to indicate a required level of navigation performance
accuracy, when operating along an ATS route or within
a specified area; and
d) to indicate that a route is used primarily or exclusively
by certain types of aircraft.
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.
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 In order to meet this purpose, the designation system
shall:
a) permit the identification of any ATS route in a simple
and unique manner;
b) avoid redundancy;
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.
1.3 Controlled, advisory and uncontrolled ATS routes,
with the exception of standard arrival and departure routes,
shall therefore be identified as specified hereafter.
2. 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) one additional letter as prescribed in 2.4.
2.1.1 The number of characters required to compose the
designator shall not exceed six characters.
2.1.2 The number of characters required to compose the
designator should, whenever possible, be kept to a maximum
of five characters.
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:
a) A, B, G, R for routes which form part of the regional
networks of ATS routes and are not area navigation
routes;
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.
Annex 11 — Air Traffic Services Appendix 1
1/11/01 APP 1-2
2.3 Where applicable, one supplementary letter shall be
added as a prefix to the basic designator in accordance with
the following:
a) K to indicate a low-level route established for use
primarily by helicopters;
b) U to indicate that the route or portion thereof is
established in the upper airspace;
c) S to indicate a route established exclusively for use by
supersonic aircraft during acceleration, deceleration and
while in supersonic flight.
2.4 When prescribed by the appropriate ATS authority or
on the basis of regional air navigation agreements, a supplementary
letter may be added after the basic designator of the
ATS route in question in order to indicate the type of service
provided or the turn performance required on the route in
question in accordance with the following:
a) for RNP 1 routes at and above FL 200, the letter Y to
indicate that all turns on the route between 30 and
90 degrees shall be made within the allowable RNP
tolerance of a tangential arc between the straight
leg segments defined with a radius of 22.5 NM
(e.g. A123Y[1]);
b) for RNP 1 routes at and below FL 190, the letter Z to
indicate that all turns on the route between 30 and
90 degrees shall be made within the allowable RNP
tolerance of a tangential arc between the straight
leg segments defined with a radius of 15 NM
(e.g. G246Z[1]);
c) the letter F to indicate that on the route or portion
thereof advisory service only is provided;
d) the letter G to indicate that on the route or portion
thereof flight information service only is provided.
Note 1.— Due to limitations in the display equipment on
board aircraft, the supplementary letters “F”, “G”, “Y” or
“Z” may not be displayed to the pilot.
Note 2.— Implementation of a route or a portion thereof as
controlled route, advisory route or flight information route is
indicated in aeronautical charts and aeronautical information
　
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