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not result in a lowering of this limit to a height of less than
2.9.2.1 Flight information regions shall be delineated to 200 m (700ft) above ground or water.
cover the whole of the air route structure to be served by such
regions. 2.9.3.3 An upper limit of a control area shall be
established when either:
2.9.2.2 A flight information region shall include all
airspace within its lateral limits, except as limited by an upper a) air traffic control service will not be provided above
flight information region. such upper limit; or
2.9.2.3 Where a flight information region is limited by an b) the control area is situated below an upper control area,
upper flight information region, the lower limit specified for in which case the upper limit shall coincide with the
the upper flight information region shall constitute the upper lower limit of the upper control area.
vertical limit of the flight information region and shall
coincide with a vi;li cruising level of the tables in Appendix 3 When established, such upper limit shall coincide with a VFR
to Annex 2. cruising level of the tables in Appendix 3 to Amex 2.
Note.- In cases where an upper flight information region
is established the procedures applicable therein need not be
identical with those applicable in the underlying flight
infunnutiun regiun.
2.9.3 Control areas
2.9.3.1 Control areas including, inter alia, airways and
terminal control areas shall he delineated so as to encompass
sufficient airspace to contain the flight paths of those IFR
flights or portions thereof to which it is desired to provide the
applicable parts of the air traffic control service, taking into
account the capabilities of the navigation aids normally used in
that area.
Note.- In a control area other than orre forrrted by a
system of airways, a system of routes may be established to
facilitate the provision of air trafic control.
2.9.4 Flight information regions or
control areas in the upper airspace
Recommendation.- Where it is desirable to limit the
number offlight information regions or control areas through
which high flying aircraft would otherwise have to operate, a
flight information region or control area, as appropriate,
should be delineated to include the upper airspace within the
lateral limits of a number of lower flight information regions
or control areas.
2.9.5 Control zones
2.9.5.1 lbe lateral limits of control zones shall encompass
at least those portions of the airspace, which are not within
control areas, containing the paths of IFFt flights amving at
and departing from aerodromes to be used under instrument
meteorological conditions.
Chapter 2 Annex 11 - Air Traffic Services
Note.- Aircraft holding in the vicinity of aerodromes are
consider-ed as at-r-iving air-cr-aft.
2.9.5.2 The lateral limits of a control zone shall extend to
at least 9.3 km (5 NM) from the centre of the aerodrome or
aerodromes concerned in the directions from which approaches
may be made.
Note.-- A control zone moy include two or more aerodromes
situated close together.
2.9.5.3 If a control zone is located within the lateral limits
of a control area, it shall extend upwards from the surface of
the earth to at least the lower limit of the control area.
Note.- An upper limit higher than the lower limit of the
overlying control area may be established when desired.
2.9.5.4 Recommendation.- If a control zone is located
outside of the lateral limits of a control area, an upper limit
should be established.
2.9.5.5 Recommendation.- If it is desired to establish
the upper limit of a control zone at a level higher than the
lower limit of the control area established above it, or ij the
control zone is located outside of the lateral limits of a control
area, its upper limit should be established at a level which can
easily he identified by pilots. When this limit is above 900 m
(3 000 ft) MSL it should coincide with a VFR cruising level of
the tables in Appendix 3 to Annex 2.
Note.- This implies that, ifused, the selected VFR cruising
level he such that expected local atmospheric pressure variations
do not result in a lowering of this limit to a height of
less than 200 m (700 ft) above ground or water.
2.10 Identification of air traffic
services units and airspaces
2.10.1 Recommendation.- An area control centre or
flight information centre should be ident@ed by the name of a
nearby town or city or geographic feature.
2.10.2 Recommendation.- An aerodrome control tower
or approach control unit should he iden:@ed by the name of
the aerodrome at which it is located.
2.10.3 Recommendation.- A control zone, control area
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