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handling communications pertaining to the operation and
control of aircraft in a given area.
Aircraft station (RR S1.83). A mobile station in the aeronautical
mobile service, other than a survival craft station,
located on board an aircraft.
Communication centre. An aeronautical fixed station which
relays or retransmits telecommunication traffic from (or to)
a number of other aeronautical fixed stations directly
connected to it.
Mobile surface station. A station in the aeronautical telecommunication
service, other than an aircraft station,
intended to be used while in motion or during halts at
unspecified points.
Network station. An aeronautical station forming part of a
radiotelephony network.
Radio direction finding (RR S1.12). Radiodetermination using
the reception of radio waves for the purpose of determining
the direction of a station or object.
Radio direction-finding station (RR S1.91). A radiodetermination
station using radio direction finding.
N o t e . The aeronautical application of radio direction
,finding is in the aeronautical radio navigation service.
Regular station. A station selected from those forming an enroute
air-ground radiotelephony network to communicate
with or to intercept communications from aircraft in
normal conditions.
Tributary station. An aeronautical fixed station that may
receive or transmit messages andior digital data but which
Chapter 1 Annex 10 - Aeronautical Telecommunications
does not relay except for the purpose of serving similar
stations connected through it to a communication centre.
intelligence of any nature by wire, radio, optical or other
electromagnetic systems.
1.4 Direction finding
1.3 Communication methods
Air-ground communication. Two-way communication
between aircraR and stations or locations on the surface of
the earth.
Air-to-ground communication. One-way communication
from aircraft to stations or locations on the surface of the
earth.
Blind transmission. A transmission from one station to
another station in circumstances where two-way communication
cannot be established but where it is believed that
the called station is able to receive the transmission.
Broadcast. A transmission of information relating to air
navigation that is not addressed to a specific station or
stations.
Duplex. A method in which telecommunication between two
stations can tale place in both directions simultaneously.
Ground-to-air communication. One-way communication
from stations or locations on the surface of the earth to
aircraft.
Interpilot air-to-air communication. Two-way communication
on the designated air-to-air channel to enable aircraft
engaged in flights over remote and oceanic areas out of
range of VHF ground stations to exchange necessary operational
information and to facilitate the resolution of
operational problems.
Non-network communications. Radiotelephony communications
conducted by a station of the aeronautical mobile
service, other than those conducted as part of a radiotelephony
network.
Radiotelephony network. A group of radiotelephony aeronautical
stations which operate on and guard frequencies from
the same family and which support each other in a defined
manner to ensure maximum dependability of air-ground
communications and dissemination of air-ground traffic.
Readback. A procedure whereby the receiving station repeats
a received message or an appropriate part thereof back to
the transmitting station so as to obtain confirmation of
correct reception.
Simplex. A method in which telecommunication between two
stations takes place in one direction at a time.
Telecommunication (RR S1.3). Any transmission, emission,
or reception of signs, signals, writing, images and sounds or
Homing. The procedure of using the direction-finding equipment
of one radio station with the emission of another
radio station, where at least one of the stations is mobile,
and whereby the mobile station proceeds continuously
towards the other station.
Radio bearing. The angle between the apparent direction of a
definite source of emission of electro-magnetic waves and
a reference direction, as determined at a radio directionfinding
station. A true radio bearing is one for which the
reference direction is that of true North. A magnetic radio
bearing is one for which the reference direction is that of
magnetic North.
1.5 Teletypewriter systems
Automatic relay installation. A teletypewriter installation
where automatic equipment is used to transfer messages
from incoming to outgoing circuits.
　
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