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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 accorda~ce 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 knsity,
types of aircraji operations andlor the manner in which the
airspace is organized and may exist even if the control areas
a d o r 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 meen seconds.
6.2.3.5 In all cases where automatic exchange of data
between air traffic services computers is required, suitable
facilities for automatic recording shall be provided.
6.2.3.6 Recordings of data and communications as
required in 6.2.3.5 shd, be retained for a period of at least
thirty days.
6.2.4 Procedures for direct-speech
communications
Recommendation.- Appropriate procedures for directspeech
communications should be developed to permit
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No. 43
Annex II - Air Traffic Services
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.
6.3 Surface movement control sewice
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
of vehicles on the manoeuvring area, except where communication
by a system of visual signals is deemed to be
adequate.
6.3.1.2 Where conditions warrant, separate communication
channels shall be provided for the control of vehicles on
the manoeuvring area. Automatic recording facilities shall be
provided on all such channels.
6.3.1.3 Recordings of communications as required in
6.3.1.2 shall be retained for a period of at least thirty days.
Note.- See also Annex 10, Volume 11, 3.5.1.5.
6.4 Aeronautical radio navigation service
6.4.1 Automatic recording
of surveillance data
6.4.1.1 Surveillance data from primary and secondary
radar equipment or obtained through ADS or other surveillance
systems, used as an aid to air traffic services, shall 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 Automatic recordings shall be retained for a period
of at least thirty days. When the recordings are pertinent to
accident and incident investigations, they shall be retained for
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