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associated with arrival or departure, in order to
accomplish objectives a) arid c) of 2.2;
c) Aerodrome control service: the provision of air traffic
control service for aerodrome traffic, except for those
parts of flights described in 2.3.1 b), in order to
accomplish objectives a), b) and c) of 2.2.
2.3.2 The flight information service, to accomplish
objective d) of 2.2.
2.3.3 The alerting service, to accomplish objective e) of
2.2.
2.4 Determination of the need for
air traffic services
2.4.1 The need for the provision of air traffic services
shall be determined by consideration of the following:
a) the types of air traffic involved;
b) the density of air traffic;
C) the meteorological conditions;
d) such other factors as may be relevant.
Note.- Due to the number of elements involved, it has not
been possible to develop specific data to deterrrtitze the need
for air trafic services in a given area or at n given location.
For example:
a) a mixture of different types of air traffic with aircraft of
varying speeds (conventional jet, etc.) might necessitate
the provision of air trafic services, whereas a relatively
greater density of traffic where only one type of operation
is involved would not:
b) meteorological conditions might have considerable effect
in areas where there is a constantflow of air trafic (e.g.
scheduled trafic), whereas similar or worse meteorological
conditions might be relatively unimportant in an
area where air trafic would be discontinued in such
conditions (e.g. local VFR flights);
c) open stretches of water, mountainous, uninhabited or
desert areas might necessitate the provision of air trafic
services even though the frequency of operations is
extremely low.
2.4.2 The carriage of airborne collision avoidance systems
(ACAS) by aircraft in a given area shall not be a factor in
determining the need for air traffic services in that area.
2.5 Designation of the portions of
the airspace and controlled aerodromes
where air traffic services will be provided
2.5.1 When it has been determined that air traffic services
will be provided in particular portions of the airspace or at
particular aerodromes, then those portions of the airspace or
those aerodromes shall be designated in relation to the air
traffic services that are to be provided.
2.5.2 The designation of the particular portions of the
airspace or the particular aerodromes shall be as follows:
2.5.2.1 Flight information regions. Those portions of the
airspace where it is determined that flight information service
and alerting service will be provided shall be designated as
flight information regions.
2.5.2.2 Control areas and control zones
2.5.2.2.1 Those portions of the airspace where it is
determined that air traffic control service will be provided to
IFR flights shall be designated as control areas or control
zones.
Note.-- The distinction between control areas and control
zones is made in 2.9.
Chapter 2 Annex 11 - Air Traffic Services
2.5.2.2.1.1 Those portions of controlled airspace wherein
it is determined that air traffic control service will also bc
provided to VFR flights shall be designated as Classes B, C,
or D airspace.
2.5.2.2.2 Where designated within a flight information
region, control areas and control zones shall form part of that
flight information region.
2.5.2.3 Controlled aerodromes. Those aerodromes where
it is determined that air traffic control service will be
provided to aerodrome traffic shall be designated as controlled
aerodromes.
2.6.3 The requirements for flights within each class of
airspace shall be as shown in the table in Appendix 4.
Note.- Where the ATS air.~nces ndjoin vertically, i.e. one
above the othes flights at a common level would comply
with requirements of, and be given services applicable to,
the less restrictive class of airspace. In applying these criteria,
Class 13 airspace is therefore considered less restrictive than
Class A airspace; Class C airspace less restrictive than
Class B airspace, etc.
2.7 Required navigation performance (RNP)
for en-route operations
2.6 Classification of airspaces 2.7.1 RNP types shall be prescribed by States. When
applicable, the RNP type(s) for designated areas, tracks or ATS
2.6.1 ATS airspaces shall be classified and designated in routes shall be prescribed on the basis of regional air
accordance with the following: navigation agreements.
Class A. IFR flights only are permitted, all flights are 2.7.2 Recommendation.- For the en-route phase of
provided with air traffic control service and are separated from flight, RNP types RNP 1, RNP 4, RNP 10, RNP 12.6 and
　
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