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each other. RNP 20 should be implemented as soon as practicable.
Class B. IFR and VFR flights are permitted, all flights are 2.7.3 The prescribed RNP type shall be appropriate to the
provided with air traffic control service and are separated from level of communications, navigation and air traffic services
each other. provided in the airspace concerned.
Class C. IFR and VFR flights are permitted, all flights are Note.- Applicable RNP types and associated procedures
provided with air traffic control service and IFR flights are are published in the Manual on Required Navigation
separated from other IFR flights and from VFR flights. VFR Performance (RNP) (Doc 9613).
flights are separated from IFR flights and receive traffic
information inmrespecot f other VFR flights.
Class D. IFR and VFR flights are permitted and all flights
are provided with air traffic control service, IFR flights are
sevarated from other IFR flights and receive traffic infor-
2.8 Establishment and designation of the
units providing air traffic services
mation in respect of VFR flights, VFR flights receive traffic
information in respect of all other flights. The air traffic services shall be provided by units established
and designated as follows:
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 trafic 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.
2.8.1 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
assigned to an air traffic control unit having adequate facilities
for the discharge of such responsibility.
Note.- This does not preclude delegating to other units the
funrtion of providing certain elements of the flight information
service.
2.8.2 Air traffic control units shall be established to
provide air traffic control service, flight information service
and alerting service within control areas, control zones and at
controlled aerodromes.
2.6.2 States shall select those airspace classes appropriate Note.- The services to be provided by various air trafic
to their needs. control units are indicated in 3.2.
Annex 11 - Air Traffic Services Chapter 2
2.9 Specifications for flight information
regions, cor~troal reas and control zones
2 9 1 Recommendation.- The delineation of airspace,
wherein air trafic services are to be provided, should be
related to the nature of the route structure and the need for
efficient service rather than to national boundaries.
Note 1.- Agreements to permit the delineation of airspace
lying across national boundaries are advisable when such
action will facilitate the provision of air traflc services (see
2.1.1). Agreements which permit delineation of airspace
boundaries by straight lines will, for example, he most
convenient where data processing techniques are used by air
trafic services units.
2.9.3.2 A lower limit of a control area shall be established
at a height above the ground or water of not less than 200 m
(700 ft).
Note.- This does not imply that the lower limit has to be
established uniformly in a given control area (see Figure A-5
of the Air Traffic Services Planning Manual (Doc 9426),
Part 1, Section 2, Chapter 3).
2.9.3.2.1 Recommendation.- The lower limit of a
control area should, when practicable and desirable in order
to allow freedom of action for VFR flights below the control
area, be established at a greater heigllf fhun ftre rninimum
specified in 2.9.3.2.
2.9.3.2.2 Recommendation.- When the lower limit of a
Note 2.- Mere delineation of airspace is made hy control area is above 900 m (3 000 ft) MSL it should coincide
reference to national boundaries there is a need for suitably with a VFR cruising level of the tables in Appendix 3 to
sited transfer points to be mutually agreed upon. Annex 2.
Note.- This implies that the selected VFR cruising level be
2.9.2 Flight information regions such that expected local atmospheric pressure variations do
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