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Frequency channel. A continuous portion of the frequency
spectrum appropriate for a transmission utilizing a specified
class of emission.
N o t e . The class~fication of emissions and infovmation
relevant to the portion of the,fvequency spectmm appropriate
,for a given type of transmission (bandwidths) is specjfied in
the ITU Radio Regulations, Article S2 and Appendix Sl.
Height. The vertical distance of a level, a point or an object
considered as a point, measured from a specified datum.
Human perfbrmance. Human capabilities and limitations
which have an impact on the safety and efficiency of
aeronautical operations.
Location indicator. A four-letter code group formulated in
accordance with rules prescribed by ICAO and assigned to
the location of an aeronautical fixed station.
Meteorological operational channel. A channel of the aeronautical
fixed service (AFS), for the exchange of aeronautical
meteorological information.
Chapter 1 Annex 10 - Aeronautical Telecommunications
Meteorological operational telecommunication network. An
integrated system of meteorological operational channels,
as part of the aeronautical fixed service (AFS), for the
exchange of aeronautical meteorological information
between the aeronautical fixed stations within the network.
N o t e . "Integrated" is to be interpreted as a mode of
operation necessay to ensure that the information can he
transmitted and received by the stations within the network in
accordance with pre-established schedules.
NOTAM. A notice distributed by means of telecommunication
containing information concerning the establishment,
condition or change in any aeronautical facility, service,
procedure or hazard, the timely Icnowledge of which is
essential to personnel concerned with flight operations.
Operational control communications. Communications
required for the exercise of authority over the initiation,
continuation, diversion or termination of a flight in the
interest of the safety of the aircraft and the regularity and
efficiency of a flight.
N o t e . Such communications are normally required,for
the exchange of messages between aircruft and aircruft
operating agencies.
Route segment. A route or portion of route usually flown
without an intermediate stop.
Routing Directory. A list in a communication centre indicating
for each addressee the outgoing circuit to be used.
SNOWTAM. A special series NOTAM notifying the
presence or removal of hazardous conditions due to
snow, ice, slush or standing water associated with snow,
slush and ice on the movement area, by means of a
specific format.
CHAPTER 2. ADMINISTRATIVE PROVISIONS RELATING TO
THE INTERNATIONAL AERONAUTICAL TELECOMMUNICATION SERVICE
2.1 Division of service
The international aeronautical telecommunication service shall
be divided into four parts:
1) aeronautical fixed service;
2) aeronautical mobile service;
3) aeronautical radio navigation service;
4) aeronautical broadcasting service.
2.2 Telecommunication - Access
All aeronautical telecommunication stations, including end
systems and intermediate systems of the aeronautical telecommunication
network (m)sha,ll be protected from unauthorized
direct or remote access.
2.3 Hours of sewice
2.3.1 The Competent Authority shall give notification of
the normal hours of service of stations and offices of the international
aeronautical telecommunication service under its
control to the aeronautical telecommunication agencies designated
to receive this information by other Administrations
concerned.
2.3.2 Whenever necessary and practicable, the Competent
Authority shall give notification of any change in the normal
hours of service, before such a change is effected, to the
aeronautical telecommunication agencies designated to receive
this information by other Administrations concerned. Such
changes shall also, whenever necessary, be promulgated in
NOTAM.
2.3.3 If a station of the international aeronautical telecommunication
service, or an aircraft operating agency,
requests a change in the hours of service of another station,
such change shall be requested as soon as possible after the
need for change is known. The station or aircraft operating
agency requesting the change shall be informed of the result of
its request as soon as possible.
2.4 Supervision
2.4.1 Each State shall designate the authority responsible
for ensuring that the international aeronautical telecommunication
service is conducted in accordance with the Procedures
in this Annex.
2.4.2 Recommendation.- Occasional infringements of
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