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necessary.
4.1.5.1 For the deployment of VHF frequencies and the avoidance of harmful interference, the 14 dB criterion is
used only for services with a cylindrical designated operational coverage (DOC) and 25 lcHz spacings.
The radio horizon is used in the other cases (8.33 and 25 kHz spacings).
Remarks. Absence of regional agreements on this point.
SUPPLEMENTTO ANNEX1 0, VOLUMEV (SECONDE DITION) UNITED~ G D O MI
CHAPTER 4
4.1.1 VHF communications frequencies are planned in accordance with planning agreements reached within
Europe. These agreements do not respect the allotment table (Table 4-1).
Remarks. To maximize the number of frequency assignments and planning efficiency that can be
achieved.
The United Kingdom encourages the use of practice PANS calls on 121.5 MHz in contradiction with the
Annex 10 requirement for the frequency to only be used in genuine emergencies.
Within Europe the bands 13 1.400 - 132.000 and 136.800 - 136.875 MHz inclusive are designated for
operational control communications. This has been agreed at a European regional level and hence
frequencies to meet aircraft operating obligations under Annex 6 may not be assigned in the
United Kingdom in the band 117.975 - 137 MHz, with the exclusion of the bands 131.400 -
132.000 MHz and 136.8 - 136.875 MHz.
Remarks. To maximize the number of frequency assignments and planning efficiency that can be
achieved.
* Recommended Practice

　
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