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flights over designated areas over which the carriage of an
emergency locator transmitter (ELT) is required, shall
continuously guard the VHF emergency frequency 121.5 MHz,
except for those periods when aircraft are canying out
communications on other VHF channels or when airborne
equipment limitations or cockpit duties do not permit
simultaneous guarding of two channels.
5.2.2.1.1.2 Aircraft shall continuously guard the VHF
emergency frequency 121 5 MHz in areas or over routes where
the possibility of interception of aircraft or other hazardous
situations exist, and a requirement has been established by the
appropriate authority.
5.2.2.1.1.3 Recommendation.- Aircraft on flights other
than those spectfied in 5.2.. 1.1.1 and 5.2.2.1.1.2 should guard
the emergency 3equency 121.5 MHz to the extentpossible.
5.2.2.1.1.4 The user of the air-to-air VHF communications
channel shall ensure that adequate watch is maintained
on designated ATS frequencies, the frequency of the aeronautical
emergency channel, and any other mandatory watch
frequencies.
5.2.2.1.2 Aeronautical stations shall maintain watch as
required by the appropriate Authority.
5.2.2.1.3 Aeronautical stations shall maintain a
continuous listening watch on VHF emergency channel 121.5
MHz during the hours of service of the units at which it is
installed.
Chapter 5 Annex 10 - Aeronautical Telecommunications
N o t e . See Annex 10, Volume 4.1.3.1.1 for provisions
related to the utilization of 121.5 MHz at aeronautical
stations.
5.2.2.1.4 When it is necessary for an aircraft station or
aeronautical station to suspend operation for any reason, it
shall, if possible, so inform other stations concerned, giving
the time at which it is expected that operation will be resumed.
When operation is resumed, other stations concerned shall be
so informed.
5.2.2.1.4.1 When it is necessary to suspend operation
beyond the time specified in the original notice, a revised time
of resumption of operation shall, if possible, be transmitted at
or near the time first specified.
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
aircraft transmissions on any of the frequencies to be
simultaneously retransmitted on the other jPequencies in use
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
primary guard whereby each station will provide the primary
guard for that portion of the flight during which the messages
from the aircraft can be handled most effectively by that
station.
5.2.2.2.4 PANS.- During its tenure of primary guard,
each regular station should, among other things:
a) be responsible for designating suitable primary and
secondary frequencies for its communications with the
aircrafi;
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).
thus permitting aircraft stations within range to hear all
transmissions to and from the controller. 5.2.2.2.5 PANS.- The transfer of primary guard )om
one station to the next will normally take place at the time of
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, termed "regular stations" for that segment.
Note 1 .Th e selection of stations to act as regular stations
for a particular route segment will, where necessary, be
undertaken by regional or local agreement, after consultation,
~f necessary, between the States responsible for the network.
Note 2 .In principle, the regular stations will be those
sewing the locations immediately concerned with flights on
that route segment, i.e. points of take-off and landing,
appropriate flight information centres or area control centres
and, in some cases, additional suitably located stations
required to complete the communication coverage or for
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