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particular emphasis being given to the occurrence or
expected occurrence of weather deterioration as soon as this
can be determined. These reports and forecasts shall cover the
flight information region or control area and such other areas
as may be determined on the basis of regional air navigation
agreements.
Note.— For the purpose of this provision, certain changes
in weather are construed as weather deterioration, although
they are not ordinarily considered as such. An increase in
temperature may, for example, adversely affect the operation
of certain types of aircraft.
7.1.2.2 Flight information centres and area control centres
shall be provided, at suitable intervals, with current pressure
data for setting altimeters, for locations specified by the flight
information centre or area control centre concerned.
7.1.3 Units providing approach
control service
7.1.3.1 Units providing approach control service shall be
supplied with current meteorological reports and forecasts for
the airspace and the aerodromes with which they are
concerned. Special reports and amendments to forecasts shall
be communicated to the units providing approach control
service as soon as they are necessary in accordance with
established criteria, without waiting for the next routine report
or forecast. Where multiple anemometers are used, the
indicators to which they are related shall be clearly marked to
identify the runway and section of the runway monitored by
each anemometer.
Note.— See Note following 7.1.2.1.
7.1.3.2 Units providing approach control service shall be
provided with current pressure data for setting altimeters, for
locations specified by the unit providing approach control
service.
7.1.3.3 Units providing approach control service for final
approach, landing and take-off shall be equipped with surface
wind indicator(s). The indicator(s) shall be related to the same
location(s) of observation and be fed from the same
anemometer(s) as the corresponding indicator(s) in the aerodrome
control tower and in the meteorological station, where
such a station exists.
7.1.3.4 Units providing approach control service for final
approach, landing and take-off at aerodromes where runway
visual range values are assessed by instrumental means shall
be equipped with indicator(s) permitting read-out of the
current runway visual range value(s). The indicator(s) shall be
related to the same location(s) of observation and be fed from
the same runway visual range measuring device(s) as the
corresponding indicator(s) in the aerodrome control tower and
in the meteorological station, where such a station exists.
Annex 11 — Air Traffic Services Chapter 7
1/11/01 7-2
7.1.3.5 Recommendation.— Units providing approach
control service for final approach, landing and take-off should
be supplied with information on wind shear which could
adversely affect aircraft on the approach or take-off paths or
during circling approach.
Note.— Provisions concerning the issuance of wind shear
warnings and ATS requirements for meteorological information
are given in Annex 3, Chapters 7 and 10, respectively.
7.1.4 Aerodrome control towers
7.1.4.1 Aerodrome control towers shall be supplied with
current meteorological reports and forecasts for the aerodrome
with which they are concerned. Special reports and amendments
to forecasts shall be communicated to the aerodrome
control towers as soon as they are necessary in accordance
with established criteria, without waiting for the next routine
report or forecast.
Note.— See Note following 7.1.2.1.
7.1.4.2 Aerodrome control towers shall be provided with
current pressure data for setting altimeters for the aerodrome
concerned.
7.1.4.3 Aerodrome control towers shall be equipped with
surface wind indicator(s). The indicator(s) shall be related to
the same location(s) of observation and be fed from the same
anemometer(s) as the corresponding indicator(s) in the meteorological
station, where such a station exists. Where multiple
anemometers are used, the indicators to which they are related
shall be clearly marked to identify the runway and section of
the runway monitored by each anemometer.
7.1.4.4 Aerodrome control towers at aerodromes where
runway visual range values are measured by instrumental
means shall be equipped with indicator(s) permitting read-out
of the current runway visual range value(s). The indicator(s)
shall be related to the same location(s) of observation and be
fed from the same runway visual range measuring device(s) as
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