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listed hererlnder:
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:
1.2 In order to meet this purpose, the designation system
shall: c) H, J, V, W for routes which do not form part of the
regional networks of ATS routes and are not area
a) permit the identification of any ATS route in a simple navigation routes;
and unique manner;
d) Q, T, Y, Z for area navigation routes which do not form
b) avoid redundancy; part of the regional networks of ATS routes.
ANNEX 11 APP 1-1 111 1/01
Annex 11 - Air Traffic Sewices Appendix 1
2.3 Where applicable, one supplementary letter shall be
added as a prefix to the basic dcsignator in accordancc 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:
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
a) for RNP 1 routes at and above FL 200, the letter Y to be assigned to any other route,
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 3.1.4 States' requirements for designators shall be notileg
segments defined with a radius of 22.5 NM fied to the Regional Offices of ICAO for coordination.
(e.g. A123Y[l]);
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
4. Use of designators
in communications
tolerance oP a tangenlial arc betwecrl the straight
leg segments defined with a radius of 15 NM 4.1 In printed communications, the designator shall be
(e.g. G246Z[l]);
expressed at all times by not less than two and not more than
six characters.
c) the letter F to indicate that on the route or portion
thereof advisory service only is provided; 4.2 In voice communications, the basic letter of a
designator shall be spoken in accordance with the ICAO
d) the letter G to indicate [hat on the route or portion 'pliing
thereof flight information service only is provided.
4.3 Where the prefixes K, U or S specified in 2.3 are
N~~~ 1,- D~~ limitations in the display equipment on used, they shall, in voice communications, be spoken as
board aircrafr, the supplementary letters "F", "G", "Y" or
"Z" may not be displayed to the pilot.
K - KOPTER
Note 2.- Implementation of a route or a portion thereof as
controlled route, advisory route or flight information mute is
indicated in aemnautical charts and aemnautical information
publications in accordance with the provisions in Annexes 4
and IF.
Note 3.- The conditions under which States may specifi
the controlled turn performance referred to in 2.4 a) and b)
are discussed in the Manual on Required Navigation
Performance (RNP) (Doc 9613).
U - UPPER
S - SUPERSONIC
The word "kopter" shall be pronounced as in the word
"helicopter" and the words "upper" and "supersonic" as in the
English language.
4.4 Where the letters "F', "G", "Y" or " Z specified in
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