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specifications on emergency locator transmitters. 19 July 1999
4 November 1999
Clarification of guidance material on VDL interference immunity 13 March 2000
performance. 17 July 2000
2 November 2000
Integrated voice and data link system (VDL Mode 3); data link 12 March 2001
satisfying surveillance applications (VDL Mode 4); update of 16 July 2001
references to the ITU Radio Regulations. 1 November 2001
Consequential changes resulting from GNSS SARPs which provide 27 February 2002
for GBAS data broadcast in the band 108 - 117.975 MHz. 15 July 2002
28 November 2002
(vii) 2811 1/02
No. 77
Chapter 4 Annex I 0 - Aeronautical Telecommunications
Where all the channels of Groups A, B, C, D and E of the
list at 4.1.8.1.2 are insuflcient to meet the requirements of a
region, a part or parts of the band may be designated as
containing 8.33 kHz width channels or designated as
supporting VDL Mode 3. For parts of the band containing
8.33 kHz width channels, the appropriate frequencies from
Group F should be used in accordance with 4.1.8.1.1.1 and
4.1.8.1.2. It should be noted that the designation offrequencies
in Group F differs from that of the corresponding frequencies
in Groups A to E to emphasize the difference in channel width.
For part of the bands supporting VDL Mode 3, frequencies
from Groups A, B, C, D and E are utilized on a time-division
basis. A single frequency supports multiple channels, each
utilizing the frequency in periodic time frames or time slots.
Specijic time sluts for VDL Mode 3 are identified using the
numeric designators of Table 4-1 (bis).
Although for Group F a preferred order of selection is not
indicated, regional planning may require a particular selection
of frequencies from this group in order to cater for specific
regional circumstances.
4.1.8.1.2 List of assignable frequencies
The list of assignable frequencies is shown in the Appendix to
this chapter.
4.1.8.1.3 Recommendation.- Frequencies for operational
control communications may be required to enable
aircraft operating agencies to meet the obligations prescribed
in Annex 6, Part I, in which case they should be selected from
the bands 128.825 - 132.025 MHz. These frequencies should
be chosen, in so far as practicable, from the upper end of the
band and in sequential order
Note.- It is recognized that the assignment of such
frequencies and the licensing of the operation of the related
facilities are mutters for national determination. Howevel; in
regions where a problem exists with respect to the provision of
frequencies for operational control puvoses, it may be
advantageous if States endeavour to coordinate the requirements
of aircraft operating agencies for such channels prior to
regional meetings.
4.1.8.2 The frequencies that may be allotted for use in the
In regions particular frequencies have been aeronautical mobile (R) service in a region shall be
assigned for particular functions as, for instance, aerodrome limited to the number determined as being necessary for
or approach control. The plan does not make such assignments operational needs in the region.
(except in respect to the emergency channel and ground
service frequencies), such action being taken regionally if Note.- The number of frequencies required in a
considered desirable. particular region is normally determined by the Council on the
recommendations of Regional Air Navigation Meetings. The
4.1.8.1 The frequencies in the band 117.975 - 137 MHz capdilit;es of^^^ equipment known to be widely used
for use in the aeronautical mobile (R) service shall be selected in the regionw ill be taken into account in determination.
from the list in 4.1.8.1.2.
4.1.8.1.1 When the number of frequencies required in a
particular region does not exceed the number of frequencies
contained in Group A of 4.1.8.1.2, the frequencies to be used
shall be selected in sequence, in so far as practicable, from
those in Group A of 4.1.8.1.2.
4.1.8.1.1.1 When the number of frequencies required in a
particular region exceeds those available in Groups A to E of
4.1.8.1.2, parts of the band shall be designated as containing
8.33 kHz width channels (voice) or as containing VDL
Mode 3. Appropriate frequencies shall be selected from
Group F of 4.1.8.1.2 for 8.33 kHz channel assignments or
from Groups A to E in accordance with the time-slot
assignments in accordance with Table 4-1 (bis) for VDL
Mode 3. The remainder of the band shall continue to be used
for 25 kHz width channels selected from the appropriate parts
of Groups A to E.
Note 1.- The frequencies 121.425 - 121.575 MHz inclusive,
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