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need to consider this question most carefully. t
4. It is further noted that, in certain regions, many NDBs
are used with voice channels and that this usage is aligned with
the Note at the head of Volume I, 3.4.6. It is expected that
regional meetings will take this fact into account when
establishing criteria for frequency planning.
ATT B-2
ATTACHMENT C. GUIDING PRINCIPLES FOR LONG DISTANCE
OPERATIONAL CONTROL COMMUNICATIONS
Note.- The numerical sequence of the clauses below does
not signib any order of relative importance.
1. Aeronautical Operational Control (AOC) HF Stations
should be authorized where no other means for the exercise of
long distance operational control are available or where the use
of the normal communication services provided for safety and
regularity of flights are unsuitable or inadequate.
2. The total number of ground stations on the worldwide
radio channels should be kept to a minimum consistent with
economic and operational efficiency. Consequently,
a) there should normally be not more than one station per
State: and
b) where an agreed affinity of interest exists between
adjoining States, a single station may be provided by
agreement among them to serve the needs of all the
aircraft operating agencies requiring a service into those
States.
3. Depending on the national policy of the State or States,
aeronautical stations could be operated by States on behalf of
one or more aircraft operating agencies provided that the
agencies' requirements for flexibility and direct communication
to their aircraft can be met, or aeronautical stations
could be operated by an aircraft operating agency or a
communication agency serving the interests of one or more
aircraft operating agencies and operating under licence issued
by the State or States concerned.
4. The licences should be issued on a regular renewal
basis and, pursuant to RR S4.11 and in accordance with
RR S43.4, should prohibit "public correspondence", or pointto-
point type traffic, or other communications traffic not
meeting the definition of operational control communications.
5. VHF (general purpose or AOC channels) and not HF
should be used when an aircraft is within the coverage of an
appropriate VHF aeronautical station.
Note.- The specific categories of messages that may be
handled on aeronautical mobile (R) sewice channels are
prescribed in Annex 10, Volume 11, Chapter 5, 5.1.8. The same
chapter defines the standard communications procedures for
the service including the requirements for maintaining watch
in Annex 10, Volume 11, Chapter 5, 5.2.2. In accordance with
RR S18.6 of the ITU Radio Regulations, licences should define
the purpose of the station for aeronautical operational control
(as defined in Annex 6, Part I) and should speciJj' the general
characteristics in accordance with Appendix S27 of the Radio
Regulations.
- END -
ANNEX 10 - VOLUME V ATT C-1
ICAO TECHNICAL PUBLICATIONS
The following summary gives the status, and also
describes in general terms the contents of the various
series of technical publications issued by the
International Civil Aviation Organization. It does not
include specialized publications that do not fall
specifically within one of the series, such as the
Aeronautical Chart Catalogue or the Meteorological
Tables for International Air Navigation.
International Standards and Recommended
Practices are adopted by the Council in accordance with
Articles 54, 37 and 90 of the Convention on
International Civil Aviation and are designated, for
convenience, as Annexes to the Convention. The
uniform application by Contracting States of the
specifications contained in the International Standards is
recognized as necessary for the safety or regularity of
international air navigation while the uniform
application of the specifications in the Recommended
Practices is regarded as desirable in the interest of
safety, regularity or efficiency of international air
navigation. Knowledge of any differences between the
national regulations or practices of a State and those
established by an International Standard is essential to
the safety or regularity of international air navigation. In
the event of non-compliance with an International
Standard, a State has, in fact, an obligation, under
Article 38 of the Convention, to notify the Council of
any differences. Knowledge of differences from
Recommended Practices may also be important for the
safety of air navigation and, although the Convention
does not impose any obligation with regard thereto, the
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