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longer periods until it is evident that they will no longer be
required.
24ll v05
No. 43
CHAPTER 7. AIR TRAFFIC SERVICES REQUIREMENTS
FOR INFORMATION
7.1 Meteorological information
7.1.1 General
7.1.1.1 Air traffic services units shall be supplied with
up-to-date information on existing and forecast meteorological
conditions as necessary for the performance of their respective
functions. The information shall be supplied in such a form as
to require a minimum of interpretation on the part of air traffic
services personnel and with a frequency which satisfies the
requirements of the air traffic services units concerned.
7.1.1.2 Recommendation.- Meteorological oflces
should be so situated as to facilitate personal consultation
between meteorological personnel and personnel of units
providing air traffic services. Where collocation is not practicable,
the required consultation should be achieved by other
means.
7.1.1.3 Recommendation.- Air tram services units
should be supplied with available detailed information on the
location, vertical extent, direction and rate of movement of
meteorological phenomena in the vicinity of the aerodrome,
and particularly in the climb-out and approach areas, which
could be hazardous to aircraft operations.
Note.- The meteorological phenomena are listed in
Annex 3, Chapter 4, 4.6.8.1.
7.1.1.4 Recommendation.- When computer-processed
upper air data are made available to air trafic services
units in digital fonn for use by air trafic services computers,
the contents, fonnat and transmission arrangements should
be as agreed between the Meteorological Authority and the
appropriate ATS Authority.
7.1.2 Flight information centres
and area control centres
7.1.2.1 Flight information centres and area control centres
shall be supplied with SIGMET and ATRMET information,
special air-reports, current meteorological reports and forecasts,
particular emphasis being given to the occurrence or
expected occurrence of deterioration in a weather element 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 meteorological conditions are constmed as deterioration in
a weather element, although they are not ordinarily considered
as such. An increase in temperature may, for example,
adversely aflect 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 sensors are used, the displays to which they
are related shall be clearly marked to identify the runway and
section of the runway monitored by each sensor.
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 display(s). The display(s) shall be related to the same
location(s) of observation and be fed from the same sensor(s)
as the corresponding display(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 display(s) permitting read-out of the current runway
visual range value(s). The display(s) shall be related to the
same location(s) of observation and be fed from the same sensor(~)
a s the corresponding displays in the aerodrome control
tower and in the meteorological station, where such a station
exists.
ANNEX 11
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