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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
publications in accordance with the provisions in Annexes 4
and 15.
Note 3.— The conditions under which States may specify
the controlled turn performance referred to in 2.4 a) and b)
are discussed in the Manual on Required Navigation
Performance (RNP) (Doc 9613).
3. Assignment of basic designators
3.1 Basic ATS route designators shall be assigned in
accordance with the following principles.
3.1.1 The same basic designator shall be assigned to a
main trunk route throughout its entire length, irrespective of
terminal control areas, States or regions traversed.
Note.— This is of particular importance where automated
ATS data processing and computerized airborne navigation
equipment is used.
3.1.2 Where two or more trunk routes have a common
segment, the segment in question shall be assigned each of the
designators of the routes concerned, except where this would
present difficulties in the provision of air traffic service, in
which case, by common agreement, one designator only shall
be assigned.
3.1.3 A basic designator assigned to one route shall not
be assigned to any other route.
3.1.4 States’ requirements for designators shall be notified
to the Regional Offices of ICAO for coordination.
4. Use of designators
in communications
4.1 In printed communications, the designator shall be
expressed at all times by not less than two and not more than
six characters.
4.2 In voice communications, the basic letter of a
designator shall be spoken in accordance with the ICAO
spelling alphabet.
4.3 Where the prefixes K, U or S specified in 2.3 are
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