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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
2-3 1/11/01
2.5.2.2.1.1 Those portions of controlled airspace wherein
it is determined that air traffic control service will also be
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 Classification of airspaces
2.6.1 ATS airspaces shall be classified and designated in
accordance with the following:
Class A. IFR flights only are permitted, all flights are
provided with air traffic control service and are separated from
each other.
Class B. IFR and VFR flights are permitted, all flights are
provided with air traffic control service and are separated from
each other.
Class C. IFR and VFR flights are permitted, all flights are
provided with air traffic control service and IFR flights are
separated from other IFR flights and from VFR flights. VFR
flights are separated from IFR flights and receive traffic
information in respect of other VFR flights.
Class D. IFR and VFR flights are permitted and all flights
are provided with air traffic control service, IFR flights are
separated from other IFR flights and receive traffic information
in respect of VFR flights, VFR flights receive traffic
information in respect of all other flights.
Class E. IFR and VFR flights are permitted, IFR flights are
provided with air traffic control service and are separated from
other IFR flights. All flights receive traffic information as far
as is practical. Class E shall not be used for control zones.
Class F. IFR and VFR flights are permitted, all participating
IFR flights receive an air traffic advisory service and all flights
receive flight information service if requested.
Note.— Where air traffic advisory service is implemented,
this is considered normally as a temporary measure only until
such time as it can be replaced by air traffic control. (See also
PANS-ATM, Chapter 9.)
Class G. IFR and VFR flights are permitted and receive
flight information service if requested.
2.6.2 States shall select those airspace classes appropriate
to their needs.
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 airspaces adjoin vertically, i.e. one
above the other, 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 B 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
2.7.1 RNP types shall be prescribed by States. When
applicable, the RNP type(s) for designated areas, tracks or ATS
routes shall be prescribed on the basis of regional air
navigation agreements.
2.7.2 Recommendation.— For the en-route phase of
flight, RNP types RNP 1, RNP 4, RNP 10, RNP 12.6 and
RNP 20 should be implemented as soon as practicable.
2.7.3 The prescribed RNP type shall be appropriate to the
level of communications, navigation and air traffic services
provided in the airspace concerned.
Note.— Applicable RNP types and associated procedures
are published in the Manual on Required Navigation
Performance (RNP) (Doc 9613).
2.8 Establishment and designation of the
units providing air traffic services
The air traffic services shall be provided by units established
and designated as follows:
2.8.1 Flight information centres shall be established to
provide flight information service and alerting service within
flight information regions, unless the responsibility of providing
such services within a flight information region is
　
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