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terms, the safety assessment may rely on operational judgement.
Note 2.— Attention is drawn to guidance material
contained in the Air Traffic Services Planning Manual
(Doc 9426), the Manual on Airspace Planning Methodology
for the Determination of Separation Minima (Doc 9689), the
Manual on Implementation of a 300 m (1 000 ft) Vertical
Separation Minimum between FL 290 and FL 410 Inclusive
(Doc 9574) and the Manual on Required Navigation
Performance (Doc 9613).
ANNEX 11 3-1 1/11/01
CHAPTER 3. AIR TRAFFIC CONTROL SERVICE
3.1 Application
Air traffic control service shall be provided:
a) to all IFR flights in airspace Classes A, B, C, D and E;
b) to all VFR flights in airspace Classes B, C and D;
c) to all special VFR flights;
d) to all aerodrome traffic at controlled aerodromes.
3.2 Provision of air traffic control service
The parts of air traffic control service described in 2.3.1 shall
be provided by the various units as follows:
a) Area control service:
1) by an area control centre; or
2) by the unit providing approach control service in a
control zone or in a control area of limited extent
which is designated primarily for the provision of
approach control service and where no area control
centre is established.
b) Approach control service:
1) by an aerodrome control tower or area control centre
when it is necessary or desirable to combine under
the responsibility of one unit the functions of the
approach control service with those of the aerodrome
control service or the area control service;
2) by an approach control unit when it is necessary or
desirable to establish a separate unit.
c) Aerodrome control service: by an aerodrome control
tower.
Note.— The task of providing specified services on the
apron, e.g. apron management service, may be assigned to an
aerodrome control tower or to a separate unit.
3.3 Operation of air traffic control service
3.3.1 In order to provide air traffic control service, an air
traffic control unit shall:
a) be provided with information on the intended movement
of each aircraft, or variations therefrom, and with
current information on the actual progress of each
aircraft;
b) determine from the information received, the relative
positions of known aircraft to each other;
c) issue clearances and information for the purpose of
preventing collision between aircraft under its control and
of expediting and maintaining an orderly flow of traffic;
d) coordinate clearances as necessary with other units:
1) whenever an aircraft might otherwise conflict with
traffic operated under the control of such other units;
2) before transferring control of an aircraft to such other
units.
3.3.2 Information on aircraft movements, together with a
record of air traffic control clearances issued to such aircraft,
shall be so displayed as to permit ready analysis in order to
maintain an efficient flow of air traffic with adequate
separation between aircraft.
3.3.3 Clearances issued by air traffic control units shall
provide separation:
a) between all flights in airspace Classes A and B;
b) between IFR flights in airspace Classes C, D and E;
c) between IFR flights and VFR flights in airspace Class C;
d) between IFR flights and special VFR flights;
e) between special VFR flights when so prescribed by the
appropriate ATS authority,
except that, when requested by an aircraft and if so prescribed
by the appropriate ATS authority for the cases listed under b)
above in airspace Classes D and E, a flight may be cleared
without separation being so provided in respect of a specific
portion of the flight conducted in visual meteorological
conditions.
3.3.4 Separation by an air traffic control unit shall be
obtained by at least one of the following:
a) vertical separation, obtained by assigning different levels
selected from:
Annex 11 — Air Traffic Services Chapter 3
1/11/01 3-2
1) the tables of cruising levels in Appendix 3 of Annex 2,
or
2) a modified table of cruising levels, when so prescribed
in accordance with Appendix 3 of Annex 2
for flight above FL 410,
except that the correlation of levels to track as
prescribed therein shall not apply whenever otherwise
indicated in appropriate aeronautical information publications
or air traffic control clearances;
Note.— Guidance material relating to vertical separation
is contained in the Manual on Implementation of
a 300 m (1 000 ft) Vertical Separation Minimum
Between FL 290 and FL 410 Inclusive (Doc 9574).
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