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appropriate, the responsible authority shall ensure that adequate
provision is made for post-implementation monitoring to
verify that the defined level of safety continues to be met.
Note 1.— When, due to the nature of the change, the
acceptable level of safety cannot be expressed in quantitative
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 (RNP) (Doc 9613).
2.27 Language proficiency
2.27.1 An air traffic services provider shall ensure that air
traffic controllers speak and understand the language(s) used
for radiotelephony communications as specified in Annex 1.
2.27.2 Except when communications between air traffic
control units are conducted in a mutually agreed language, the
English language shall be used for such communications.
2.28 Contingency arrangements
Air traffic services authorities shall develop and promulgate
contingency plans for implementation in the event of
disruption, or potential disruption, of air traffic services and
related supporting services in the airspace for which they are
responsible for the provision of such services. Such contingency
plans shall be developed with the assistance of ICAO as
necessary, in close coordination with the air traffic services
authorities responsible for the provision of services in adjacent
portions of airspace and with airspace users concerned.
Note 1.— Guidance material relating to the development,
promulgation and implementation of contingency plans is
contained in Attachment D.
Note 2.— Contingency plans may constitute a temporary
deviation from the approved regional air navigation plans;
such deviations are approved, as necessary, by the President of
the ICAO Council on behalf of the Council.
27/11/03
No. 42
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
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