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operational control communications
3.1.3.1 Worldwide frequencies for aeronautical operational
control communications are required to enable aircraft
operating agencies to meet the obligations prescribed in
Annex 6, Part I. Assignment of these frequencies shall be in
accordance with the following provisions of Appendix S27:
S2719 A world-wide allotment area is one in which
frequencies are allotted to provide long distance
communications between an aeronautical station
within that allotment area and aircraft operating
anywhere in the world.*
S271217 The world-wide frequency allotments appearing in
the tables at No. S271213 and Nos. S271218 to
S271231, except for carrier (reference) frequencies
3 023 kHz and 5 680 kHz, are reserved for
assignment by administrations to stations operating
under authority granted by the administration
concerned for the purpose of serving one or more
aircraft operating agencies. Such assignments are to
provide communications between an appropriate
aeronautical station and an aircraft station anywhere
in the world for exercising control over
regularity of flight and for safety of aircraft.
World-wide frequencies are not to be assigned by
administrations for MWARA, RDARA and
VOLMET purposes. Where the operational area of
an aircraft lies wholly within a RDARA or
sub-RDARA boundary, frequencies allotted to
those RDARAs and sub-RDARAs shall be used.
* The type of communications referred to in S2719 may be regulated
by administrations.
Note I.- Tables S27/213 and S27/218 to S27/231
appearing in Appendix S27 to the ITU Radio Regulations
refer to, respectively, the Frequency Allotment Plan, listing
frequencies by areas, and the Frequency Allotment Plan,
listing frequencies in numerical order
Note 2.- Guidance material on the assignment of
worldwide frequencies is contained in Attachment C.
3.2 NDB frequency management
3.2.1 Recommendation.- NDB frequency management
should take into account the following:
a) the interference protection required at the edge of the
rated coverage;
b) the application of the figures shown for typical ADF
equipment;
c) the geographical spacings and the respective rated
coverages;
d) the possibility of interference from spurious radiation
generated by non-aeronautical sources (e.g. electric
power services, power line communication systems,
industrial radiation, etc.).
Note 1.- Guidance material to assist in determining the
application of the foregoing is given in Attachment B.
Note 2.- Attention is drawn to the fact that some portions
of the bands available for aeronautical beacons are shared
with other services.
3.2.2 Recommendation.- To alleviate frequency
congestion problems at locations where two separate 1L.S
facilities serve opposite ends of a single runway, the assignment
of a' common frequency to both of the outer locators
should be permitted, and the assignment of a common
frequency to both of the inner locators should be permitted,
provided that:
a) the operational circumstances permit;
b) each locator is assigned a diflerent ident$ication signal;
and
c) arrangements are made whereby locators using the
same frequency cannot radiate simultaneously.
Note.- The Standard in Volume 1, 3.4.4.4, specijies the
equipment arrangements to be made.
CHAPTER 4. UTILIZATION OF FREQUENCIES ABOVE 30 MHz
4.1 Utilization in the band
117.975 - 137 MHz
Introduction
The band 118 - 132 MHz was allocated in 1947 by the
Atlantic City ITU Radio Conference, and again in 1959 by the
Geneva Conference, but with extension downwards to
117.975 MHz, for the exclusive use by the aeronautical
mobile (R) service.
ITU Radio Conferences subsequent to 1947 also made
provisions for the use of the band 132 - 136 MHz for the
aeronautical mobile (R) service under conditions which vary
for the dlrerent ITU Regions, countries or combination of
countries. The utilization of this band has been included in the
Allotment Table in this chapte,: The ITU' World Administrative
Radio Conference (1979) made provisions for the use of the
band 136 - 137 MHz by the aeronautical mobile (R) service,
subject to conditions of Nos. S5.203, S5.203A and S5.203B of
the Radio Regulations. The use of frequencies in the 136 -
137 MHz part of the band must take account of the conditions
contained in these notes. In the utilization of these' bands,
States' attention is drawn to the possibility of harmful radio
intelference from non-aeronautical sources of radio frequency
energy and the need to take appropriate measures to minimize
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