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N o t e . This term covers both ,fully automatic and semiautomatic
installations.
Fully automatic relay installation. A teletypewriter installation
where interpretation of the relaying responsibility in
respect of an incoming message and the resultant settingup
of the connections required to effect the appropriate
retransmissions is carried out automatically, as well as all
other normal operations of relay, thus obviating the need
for operator intervention, except for supervisory purposes.
Message field. An assigned area of a message containing
specified elements of data.
Semi-automatic relay installation. A teletypewriter installation
where interpretation of the relaying responsibility in
respect of an incoming message and the resultant settingup
of the connections required to effect the appropriate
retransmissions require the intervention of an operator but
where all other normal operations of relay are carried out
automatically.
Teletypewriter tape. A tape on which signals are recorded in
the 5-unit Start-Stop code by completely severed perforations
(Chad Type) or by partially severed perforations
(Chadless Type) for transmission over teletypewriter
circuits.
"Torn-tape" relay installation. A teletypewriter installation
where messages are received and relayed in teletypewriter
tape form and where all operations of relay are performed
as the result of operator intervention.
Annex 10 - Aeronautical Telecommunications Volume II
1.6 Agencies
Aeronautical telecommunication agency. An agency responsible
for operating a station or stations in the aeronautical
telecommunication service.
Aircrajt operating agency. The person, organization or enterprise
engaged in, or offering to engage in, an aircraft
operation.
1.7 Frequencies
Primary jkequency. The radiotelephony frequency assigned to
an aircraR as a first choice for air-ground communication
in a radiotelephony network.
Secondary jkequency. The radiotelephony frequency assigned
to an aircraft as a second choice for air-ground communication
in a radiotelephony network.
N o t e . Details of the AIREP ,form are given in
PANS-ATM (DOC 4444).
Altitude. The vertical distance of a level, a point or an object
considered as a point, measured from mean sea level
(MSL).
ATS direct speech circuit. An aeronautical fixed service (AFS)
telephone circuit, for direct exchange of information
between air traffic services (ATS) units.
Automatic telecommunication log. A record of the activities
of an aeronautical telecommunication station recorded by
electrical or mechanical means.
Flight level. A surface of constant atmospheric pressure which
is related to a specific pressure datum, 1013.2
hectopascals (hPa), and is separated from other such
surfaces by specific pressure intervals.
Note 1 . A pressure type altimeter calibrated in
accordance with the standard atmosphere:
1.8 Data link communications
Controller-pilot data link communications (CPDLC). A
means of communication between controller and pilot,
using data link for ATC communications.
Current data authority. The designated ground system
through which a CPDLC dialogue between a pilot and a
controller currently responsible for the flight is permitted to
take place.
Downstream data authority. A designated ground system,
different from the current data authority, through which the
pilot can contact an appropriate ATC unit for the purposes
of receiving a downstream clearance.
Next data authority. The ground system so designated by the
current data authority through which an onward transfer of
communications and control can tale place.
1.9 Miscellaneous
Aeronautical jixed circuit. A circuit forming part of the aeronautical
fixed service (AFS).
Aeronautical jixed telecommunication network circuit. A
circuit forming part of the aeronautical fixed telecommunication
network (AFTN).
Aeronautical telecommunication log. A record of the activities
of an aeronautical telecommunication station.
Air-report. A report from an aircraft in flight prepared in
conformity with requirements for position, and operational
and/or meteorological reporting.
a) when set to a QNH altimeter setting, will indicate
altitude;
b) when set to a QFE altimeter setting, will indicate height
above the QFE reference datum;
c) when set to a pressure 1013.2 hPa, may he used to
indicate,flight levels.
Note 2 .Th e terms "height" and "altitude", used in
Note 1 above, indicate altimetric rather than geometric heights
and altitudes.
　
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