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5.2.2.1.5 Recommendation.- When two or more ATS
frequencies are being used by a controller, consideration
should be given to providing facilities to allow ATS and
aircrafr transmissions on any of the frequencies to be
simultaneously retransmitted on the other jizquencies in use
thus permitting aircrafr stations within range to hear all
transmissions to and from the controller.
5.2.2.2 Principles of network operation
(HF communications)
5.2.2.2.1 PANS.- The aeronautical stations of a
radiotelephony network should assist each other in
accordance with the following network principles, in order to
provide the air-ground communication service required of the
network by aircraft flying on the air routes for which the
network is responsible.
5.2.2.2.2 PANS.- When the network comprises a large
number of stations, network communications for flights on any
individual route segment should be provided by selected
stations, tenned "regular stations" for that segment.
Note 1.- The selection of stations to act as regular stations
for a particular route segment will, where necessary, be
undertaken by regionul or local agreement, afer consultation,
if necessaly, between the States responsible for the netwonk.
Note 2.- In principle, the regular stations will be those
serving the locations immediately concerned with flights on
that route segment, i.e. points of take-of and landing,
appropriate flight information centres or area control centres
and, in some cases, ndditional suitably located stations
required to complete the communication coverage or for
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 oflights or distance between aermutical
stations require additional measures to ensure continuity of
air-ground communication throughout the route segment, the
regular stations should share between them a responsibility of
24/11/05
No. 80
Annex 10 - Aeronuutical Teleconununications Volume II
primary guard whereby each station will provide the primary between network stations of messages essential for
guard for that portion of the flight during which the messages coordination and cooperation between the stations, such
from the aircraft can be handled most effectively by that communication should, so far as possible, be effected over
station. network frequencies not being used at that rime for the bulk of
the air-ground trafic. In all cases, the communication with
5.2.2.2-4 PANS-- During its tenure of Primary guard. aircraft stations should take priority over the inter-ground
each regular station should, among other things: station communications.
a) be responsible for designating suitable primary and
secondary frequencies for its communications with the
aircraft;
b) receive all position reports and handle other messages
from and to the aircraft essential to the safe conduct of
the flight;
C) be responsible for the action required in case of failure
of communications (see 5.2.2.7.2).
5.2.2.2.5 PANS.- The transfer of primary guard from
one station to the next will normally take place at the time of
the traversing of flight information region or control area
boundaries, this guard being provided at any time, as far as
possible, by the station serving 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, if appreciable improvement in
air-ground communication can be effected thereby.
5.2.2.3 Frequencies to be used
5.22.3.1 Aircraft stations shall operate on the appropriate
radio frequencies.
5.22.3.1.1 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 aircrafr makes
pre-flght check or its initial contact after take-08 This station
should also ensure that other network stations are advised, as
required, of the frequenqfies) 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
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