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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
used, they shall, in voice communications, be spoken as
follows:
K — KOPTER
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
2.4 above are used, the flight crew should not be required to
use them in voice communications.
ANNEX 11 APP 2-1 1/11/01
APPENDIX 2. PRINCIPLES GOVERNING THE ESTABLISHMENT AND
IDENTIFICATION OF SIGNIFICANT POINTS
(Chapter 2, Section 2.13 refers)
1. Establishment of significant points
1.1 Significant points should, whenever possible, be
established with reference to ground-based radio navigation
aids, preferably VHF or higher frequency aids.
1.2 Where such ground-based radio navigation aids do
not exist, significant points shall be established at locations
which can be determined by self-contained airborne navigation
aids, or, where navigation by visual reference to the ground is
to be effected, by visual observation. Specific points may be
designated as ‘‘transfer of control’’ points by agreement
between adjacent air traffic control units or control positions
concerned.
2. Designators for significant points
marked by the site of
a radio navigation aid
2.1 Plain language name for significant points
marked by the site of a radio navigation aid
2.1.1 Whenever practicable, significant points shall be
named with reference to an identifiable and preferably
prominent geographical location.
2.1.2 In selecting a name for the significant point, care
shall be taken to ensure that the following conditions are
met:
a) the name shall not create difficulties in pronunciation
for pilots or ATS personnel when speaking in the
language used in ATS communications. Where the
name of a geographical location in the national language
selected for designating a significant point gives rise
to difficulties in pronunciation, an abbreviated or
contracted version of this name, which retains as much
of its geographical significance as possible, shall be
selected;
Example: FUERSTENFELDBRUCK = FURSTY
b) the name shall be easily recognizable in voice
communications and shall be free of ambiguity with
those of other significant points in the same general
area. In addition, the name shall not create confusion
with respect to other communications exchanged between
air traffic services and pilots;
c) the name should, if possible, consist of at least six letters
and form two syllables and preferably not more than
three;
d) the selected name shall be the same for both the
significant point and the radio navigation aid marking it.
2.2 Composition of coded designators for
significant points marked by the site
of a radio navigation aid
2.2.1 The coded designator shall be the same as the radio
　
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