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Service (Geneva 1978) and Appendix 27 Aer2 to the Radio
Regulations, except the Frequency Allotment Plan which
entered into force at 0001 hours' UTC, 1 February 1983. In the
Radio Regulations, 1998 version, based on the World Administrative
Radio Conference for the Mobile Services (1987),
Appendix S27 now incorporates editorial amendments to
Appendix 27 Aer2. In the utilization of these bands, States'
attention is drawn to the possibility of harmful radio
interference from non-aeronautical sources of mdio frequency
energy and the need to take appropriate measures to minimize
its effects.
3.1 Method of operations
3.1.1 In the aeronautical mobile service, single channel
simplex shall be used in radiotelephone communications
utilizing radio frequencies below 30 MHz in the bands
allocated exclusively to the aeronautical mobile (R) service.
3.1.2 Assignment of single sideband channels
3.1.2.1 Single sideband channels shall be assigned in
accordance with Volume 111, Part 11, Chapter 2, 2.4.
3.1.2.2 For the operational use of the channels concerned
administrations shall take into account the provisions of
S27/19 of Appendix S27 of the ITU Radio Regulations.
3.1.2.3 Recommendation.- The use of aeronautical
mobile (R) frequencies below 30 MHz for international
operations should be coordinated as specified in Appendix S27
of the ITU Radio Regulations as follows:
S27/19 The International Civil Aviation Organization
(ICAO) co-ordinates radiocommunications of the
aeronautical mobile (R) service with international
aeronautical operations and this Organization should
be consulted in all appropriate cases in the
operational use of the frequencies in the Plan.
3.1.2.4 Recommendation.- Where international operating
requirements for HF communications cannot be satisjied
by the Frequency Allotment Plan at Part 2 of Appendix S27 to
the Radio Regulations, an appropriate frequency may be
assigned as specified in Appendix S27 by the application of the
following provisions:
S27120 It is recognized that not all the sharing possibilities
have been exhausted in the Allotment Plan contained
in this Appendix. Therefore, in order to satisfy
particular operational requirements which are not
otherwise met by this Allotment Plan, administrations
may assign frequencies from the aeronautical
mobile (R) bands in areas other than those to which
they are allotted in this Plan. However, the use of the
frequencies so assigned must not reduce the protection
to the same frequencies in the areas where
they are allotted by the Plan below that determined
by the application of the procedure defined in Part I,
Section I1 B of this Appendix.
Note.- Part I, Section I1 B of Appendix S27 relates to
Interference Range Contours, and application of the procedure
results in a protection ratio of 15 dB.
S27121 When necessary to satisfy the needs of international
.air operations administrations may adapt the allotment
procedure for the assignment of aeronautical
mobile (R) frequencies, which assignments shall then
be the subject of prior agreement between administrations
affected.
S27/22 The co-ordination described in No. S27/21 shall be
effected where appropriate and desirable for the
efficient utilization of the frequencies in question,
and especially when the procedures of No. S27119
are unsatisfactory.
3.1.2.5 The use of classes of emission J7B and J9B shall
be subject to the following provisions of Appendix S27:
S27/12 For radiotelephone emissions the audio frequencies
will be limited to between 300 and 2 700 Hz and the
occupied bandwidth of other authorized emissions
ANNEX 10 - VOLUME V 3- 1 1/11/01
Annex 10 - Aeronaufical Telecommunications Volume V
will not exceed the upper limit of J3E emissions. In
specifying these limits, however, no restriction in
their extension is implied in so far as emissions other
than J3E are concerned, provided that the limits of
unwanted emissions are met (see Nos. S27173 and
S27174).
S27/14 On account of the possibility of interference, a given
channel should not be used in the same allotment
area for radiotelephony and data transmissions.
S27/15 The use of channels derived from the frequencies
indicated in S27118 for the various classes of
emissions other than J3E and H2B will be subject to
special arrangements by the administrations concerned
and affected in order to avoid harmful
interference which may result from the simultaneous
use of the same channel for several classes of
emission.
3.1.3 Assignment of frequencies for aeronautical
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