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occurrence of a communication failure is suspected.
N o t e . A speczfic time period may be prescribed by the
appropriate ATS Authority.
5.2.2.7.2.3 Recommendation.- lfthe attempts speczfied
in 5.2.2.7.2.1 fail, the aeronautical station should transmit
messages addressed to the aircraft, other than messages
containing air traffic control clearances, by blind transmission
on the fiequency(ies) on which the aircraft is believed to be
listening.
5.2.2.7.2.4 Blind transmission of air traffic control
clearances shall not be made to aircraft, except at the specific
request of the originator.
5.2.2.7.3 Notzfication of communications failure. The
air-ground control radio station shall notify the appropriate air
traffic services unit and the aircraft operating agency, as soon
as possible, of any failure in air-ground communication.
5.2.3 HF message handling
5.2.3.1 General
5.2.3.1.1 PANS.- When operating within a network, an
aircraft station should, in principle, whenever communications
conditzons so permit, transmzt its messages to the stations of
the network from which they can be most readily delivered to
their ultimate destinations. In particular, aircraft reports
required by air traffic services should be transmitted to the
network station serving the flight information centre or area
control centre in whose area the aircraft is flying. Conversely,
messages to aircraft in flight should, whenever possible, be
transmitted directly to the aircraft by the network station
sewing the location of the originatou:
N o t e . Exceptionally, an aircraft may need to communicate
with an aeronautical station outside the network appro-
5.2.2.7.2 Ground-to-air priate to its particular route segment. This is permissible,
provided it can be done without interrupting the continuous
5.2.2.7.2.1 When an aeronautical station has been unable with the communication network appropriate to the
to establish contact with an aircraft station after calls on the route segment, when such watch is required by the appropriate
frequencies on which the aircraft is believed to be listening, it ATS Authority, and provided it does not cause undue
shall: interference with the operation of other aeronautical stations.
a) request other aeronautical stations to render assistance 5.2.3.1.2 PANS.- Messages passed from an aircraft to a
by calling the aircraft and relaying traffic, if necessary; network station should, whenever possible, be intercepted and
Annex 10 - Aeronautical Telecomrmtnications Volume I1
acknowledged by other stations of the network, which serve
locations where the information is also required.
Note 1 .De termination of the arrangements for dissemination
of air-ground messages without address will be a
matter for multilateral or local agreement.
Note 2 .In principle, the number of stations required to
intercept are to be kept to a minimum consistent with the
operational requirement.
5.2.3.1.2.1 PANS.- Acknowledgement of intercept
should be made immediately afer the acknowledgement of
receipt by the station to which the message was passed.
5.2.3.1.2.2 PANS.- Acknowledgement of an intercept
message should be made by transmitting the radio call sign of
the station having intercepted the message, followed by the
word ROGER, 7f desired, and the call sign of the station
having transmitted the message.
5.2.3.1.2.3 PANS.- In the absence of acknowledgement
of intercept within one minute, the station accepting the
message f m th e aircraft should forward it, normally over the
aeronautical fixed service, to the station(sj which have failed
to acknowledge intercept.
5.2.3.1.2.3.1 PANS.- IJ; in abnormal circumstances,
forwarding is necessary using the air-gvound channels, the
provisions of 5.2.2.3.4 should be observed.
5.2.3.1.2.4 PANS.- When such forwarding is done over
the aeronautical fixed telecommunication network, the
messages should be addressed to the network station(s)
concerned.
5.2.3.1.2.5 PANS.- The station(s) to which the
messages have been forwarded should carry out local distribution
of them in the same way as ~f they had been received
directly from the aircraft over the air-ground channel.
5.2.3.1.2.6 The aeronautical station receiving an airreport
or a message containing meteorological information
transmitted by an aircraft in flight shall forward the message
without delay:
1) to the air traffic services unit and meteorological offices
associated with the station;
2) to the aircraft operating agency concerned or its
representative when that agency has made a specific
request to receive such messages.
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