7754 Vol 2 Flyleaf - ICAO Public Maps

V.II-A2
EUR FASID
Note.— The values defined in b), c) and d) above
should include traffic handled by the relevant ATS radio
control position on UHF as well, if a channel in this
frequency band is provided.
4. The use of the above described terms and
definitions will make it possible to compare data obtained
for assessment purposes with data provided for traffic
forecasting in specific parts of the region.
Data on airspace configuration
5. When assessing the configuration of the airspace
under factor 2 b) above, the following data are used:
a) number of ATS routes served;
b) number of intersections of ATS routes;
c) proportions of aircraft in level flight and in climb or
descent; and
d) significant groups of airspeed.
communications or the application of the “silent control”
concept, it will nevertheless be useful if reasonable
allowances are made for this factor in the assessment of the
need for ATS radio control positions, especially in those
cases where the possibility of combination of two or more
ATS functions into one single ATS radio control position is
being considered.
Special national requirements
8. As special national requirements, by virtue of their
nature, vary from State to State, no generally applicable
method of their assessment can be developed. It is, however,
noted that methods to cater for identical national
requirements also vary considerably from State to State,
some of them requiring a minimum of effort on the part of
ATS, others resulting in a considerable workload.
9. Consequently, this matter should be reviewed on
the national level but drawing on experience obtained by
other States so that the most efficient method, satisfying a
specific national requirement, is selected by the State
concerned.
Methods of control
6. When assessing the method of control used, it is
necessary to differentiate between the following:
a) procedural control;
b) primarily procedural control supplemented by varying
degrees of use of primary radar;
c) radar control based on the use of primary radar;
d) radar control based on the use of SSR without Mode C;
e) radar control based on the use of SSR with Mode C;
Average capability of the
control personnel
10. As this factor is, to a very large extent,
determined by administrative, organizational and social
considerations which, at present, vary considerably from
State to State, it will escape uniform assessment throughout
the region for a long time to come. In addition, subjective
appreciation enters into this question to a significant extent.
11. While it would therefore appear that this factor
cannot, for the time being, be the subject of an objective
and uniform assessment, it is nevertheless considered as the
one having the largest single influence on the problem
under consideration.
f) use of automatic equipment by the ATS radio control
position; and
g) use of automatic equipment between ATS units.
Effects resulting from the reduction in
air-ground communications
7. While it will be difficult to quantify the effects
achieved from the systematic reduction of air-ground
ECONOMY IN THE USE OF ATS
AIR-GROUND COMMUNICATIONS
CHANNELS
12. Arrangements for ATS VHF air-ground
communications should be reviewed with a view to utmost
economy and, where necessary, corrective measures should
be taken especially with regard to: