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by a system of visual signals is deemed to be
adequate.
6.3.1.2 Recommendation.- Where conditions warrant,
separate communication channels should be provided for the
control of vehicles on the manoeuvring area. Automatic
recording facilities should be provided on all such channels.
6.4 Aeronautical radio navigation service
6.4.1 Automatic recording
of surveillance data
6.4.1.1 Recommendation.- Surveillance data from
primary and secondary radar equipment or obtained through
ADS, used as an aid to air traJic services, should be
automatically recorded for use in accident and incident
investigations, search and rescue, air traffic control and
surveillance systems evaluation and training.
6.4.1.2 Recommendation.- Automatic recordings should
be retained for a period of at least fourteen days. When the
recordings are pertinent to accident and incident investigations,
they should be retained for longer periods until it is
evident that they will no longer be required.
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 ofices
should be so situated as to facilitate personal consultation
between meteorological personnel and personnel of units
providing air t r a f i services. Where collocation is not
practicable, the required consultation should be achieved by
other means.
7.1.1.3 Recommendation.- Air trafic services units
should be supplied with available detailed information on the
lucutiun, verficul extenf, direcfiun urul rule uf movement of
meteorological phenomena in the vicinio of the aerodrome,
and particularly in the climb-out and approach areas, which
could be hazardous to aircraji operations.
Note.- The meteorological phenomena are listed in
Annex 3, Chapter 4, 4.12.1.
7.1.1.4 Recommendation.- When computer-processed
upper air data are made available to air traffic services
units in digital form for use by air trajjic services computers,
the contents, format and transmission arrangements should
be as agreed between the Meteorological Authoriv 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 AIRMET information,
special air-reports, current meteorological reports and forecasts,
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 aircraji.
7.1.2.2 Flight information ccntres and arca control ccntres
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.
7.1.1.1 IJnits providing approach control service for final
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