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intercept purposes.
Note 3 .In selecting the regular stations, account will be
taken of the propagation characteristics of the frequencies
used.
5.2.2.2 3 PANS.- In areas or on routes where radio
conditions, length offlights or distance between aeronautical
the traversing of flight information region or control area
boundaries, this guard being provided at any time, as far as
possible, by the station sewing the flight information centre or
area control centre in whose area the aircraft is flying.
However, where communication conditions so demand, a
station may be required to retain primary guard beyond such
geographical boundaries or release its guard before the
aircraft reaches the boundary, ~f appreciable improvement in
air-ground communication can be effected thereby.
5.2.2.3 Frequencies to be used
5.2.2.3.1 Aircraft stations shall operate on the appropriate
radio frequencies.
5.2.2.3 . l . 1 The air-ground control radio station shall
designate the frequency(ies) to be used under normal
conditions by aircraft stations operating under its control.
5.2.2.3.1.2 PANS.- In network operation, the initial
designation of primary and secondary frequencies should be
made by the network station with which the aircraft makes
pre-flight check or its initial contact after take-08 This station
should also ensure that other network stations are advised, as
required, of the frequency(ies) designated.
5.2.2.3.2 Recommendation.- An aeronautical station,
when designating frequencies in accordance with 5.2.2.3.1.1
or 5.2.2.3.1.2, should take into account the appropriate
propagation data and distance over which communications are
required.
5.2.2.3.3 Recommendation.- If a frequency designated
by an aeronautical station proves to be unsuitable, the aircraft
station should suggest an alternative frequency.
Annex 10 - Aeronautical Telecomrmtnications Volume I1
5.2.2.3.4 PANS.- When, notwithstanding the provisions
of 5.1.1, air-ground frequencies are used for the exchange
between network stations of messages essential for
coordination and cooperation between the stations, such
communication should, so far as possible, be effected over
network frequencies not being used at that time for the bulk of
the air-ground traffic. In all cases, the communication with
aircraft stations should take priority over the inter-ground
station communications.
5.2.2.4 Establishment of communications
advice, the aircraft station should notzjj the appropriate
aeronautical station before such transfer takes place.
5.2.2.5.2 PANS.- In the case of transfer from one
network to another, the transfer should preferably take place
while the aircraft is in communication with a station operating
in both networks to ensure continuity of communications. IJ;
however, the change of network must take place concurrently
with the transfer of communication to another network station,
the transfer should be coordinated by the two network stations
prior to advising or authorizing the frequency change. The
aircraft should also be advised of the primary and secondary
frequencies to be used after the transfer.
5.2.2.4.1 Aircraft stations shall, if possible, communicate
directly with the air-ground control radio station appropriate to 5.2.2.5.3 An aircraft station which has transferred
the area in which the aircraft are flying, If unable to do so, communications watch from one radio frequency to another
aircraft stations shall use any relay means available and shall, when so required by the appropriate ATS Authority,
appropriate to transmit messages to the air-ground control inform the aeronautical station concerned that communications
radio station. watch has been established on the new frequency.
5.2.2.4.2 When normal communications from an
aeronautical station to an aircraft station cannot be established,
the aeronautical station shall use any relay means available
and appropriate to transmit messages to the aircraft station. If
these efforts fail, the originator shall be advised in accordance
with procedures prescribed by the appropriate Authority.
5.2.2.4.3 PANS.- When, in network operation,
communication between an aircraft station and a regular
station has not been established after calls on the primary and
secondary frequencies, aid should be rendered by one of the
other regular stations for that flight, either by calling the
attention of the station first called or, in the case of a call
made by an aircraft station, by answering the call and taking
the traffic.
5.2.2.4.3.1 PANS.- Other stations of the network should
render assistance by tahng similar action only zf attempts to
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