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circuit television or separate information processing systems.
6.2.2.3.5 The communication facilities required under
6.2.2.2.2 a), b) and c) shall include provisions for communications
by direct speech arranged for conference
communications.
6.2.2.3.6 Recommendation.— The communication facilities
required under 6.2.2.2.2 d) should include provisions for
communications by direct speech arranged for conference
communications, whereby the communications can normally
be established within fifteen seconds.
6.2.2.3.7 All facilities for direct-speech or data link communications
between air traffic services units and between air
traffic services units and appropriate military units shall be
provided with automatic recording.
6.2.2.3.8 Recommendation.— All facilities for directspeech
or data link communications required under 6.2.2.2.1
and 6.2.2.2.2 and not otherwise covered by 6.2.2.3.7 should be
provided with automatic recording.
6.2.3 Communications between
flight information regions
6.2.3.1 Flight information centres and area control centres
shall have facilities for communications with all adjacent flight
information centres and area control centres.
6.2.3.1.1 These communication facilities shall in all cases
include provisions for messages in a form suitable for retention
as a permanent record, and delivery in accordance with
transit times specified by regional air navigation agreements.
6.2.3.1.2 Unless otherwise prescribed on the basis of
regional air navigation agreements, facilities for communications
between area control centres serving contiguous
control areas shall, in addition, include provisions for directspeech
and, where applicable, data link communications, with
automatic recording, whereby for the purpose of transfer of
control using radar or ADS data, the communications can be
established instantaneously and for other purposes the
communications can normally be established within fifteen
seconds.
6.2.3.1.3 When so required by agreement between the
States concerned in order to eliminate or reduce the need for
interceptions in the event of deviations from assigned track,
facilities for communications between adjacent flight information
centres or area control centres other than those
mentioned in 6.2.3.1.2 shall include provisions for direct speech
alone, or in combination with data link communications. The
communication facilities shall be provided with automatic
recording.
6.2.3.1.4 Recommendation.— The communication facilities
in 6.2.3.1.3 should permit communications to be established
normally within fifteen seconds.
6.2.3.2 Recommendation.— Adjacent ATS units should
be connected in all cases where special circumstances exist.
Note.— Special circumstances may be due to traffic density,
types of aircraft operations and/or the manner in which the
airspace is organized and may exist even if the control areas
and/or control zones are not contiguous or have not (yet) been
established.
6.2.3.3 Recommendation.— Wherever local conditions
are such that it is necessary to clear aircraft into an adjacent
control area prior to departure, an approach control unit and/
or aerodrome control tower should be connected with the area
control centre serving the adjacent area.
6.2.3.4 Recommendation.— The communication facilities
in 6.2.3.2 and 6.2.3.3 should include provisions for communications
by direct speech alone, or in combination with data
link communications, with automatic recording, whereby for
the purpose of transfer of control using radar or ADS data, the
communications can be established instantaneously and for
other purposes the communications can normally be established
within fifteen seconds.
6.2.3.5 Recommendation.— In all cases where automatic
exchange of data between air traffic services computers is
required, suitable facilities for automatic recording should be
provided.
6.2.4 Procedures for direct-speech
communications
Recommendation.— Appropriate procedures for directspeech
communications should be developed to permit
immediate connections to be made for very urgent calls
concerning the safety of aircraft, and the interruption, if
necessary, of less urgent calls in progress at the time.
Annex 11 — Air Traffic Services Chapter 6
1/11/01 6-4
6.3 Surface movement control service
6.3.1 Communications for the control of
vehicles other than aircraft
on manoeuvring areas at
controlled aerodromes
6.3.1.1 Two-way radiotelephony communication facilities
shall be provided for aerodrome control service for the control
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