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IV-CNS 3-A-E-1
Appendix A to Table CNS 3
GEOGRAPHICAL SEPARATION CRITERIA FOR
VOR, VOR/DME AND ILS INSTALLATIONS
VHF omnidirectional radio range
(VOR)/distance measuring equipment (DME)
1. In the selection of frequencies for VOR and/or
VOR/DME the following criteria are to be applied:
a) for VOR required to serve en-route flight operations up to
FL 500, geographic separations should be:
1) for co-channel: 1 020 km (550 NM) between
200 NM/FL 450 facilities;
2) for adjacent channel: 410 km (220 NM);
b) for VORs required for use in terminal areas (40 NM/
FL 250) geographic separation should be:
1) for co-channel: 370 km (200 NM);
2) for adjacent channel: 110 km (60 NM);
c) for VORs required for use in final approach and landing
(25 NM/FL 100) geographic separation should be:
1) for co-channel: 240 km (130 NM);
2) for adjacent channel: 55 km (30 NM);*
2 Detailed frequency assignment criteria for VOR are
provided in Annex 10, Volume I, 3.3.2 with related guidance
material in Attachment C, 3.4 and 3.5, and in Annex 10,
Volume V, 4.2.
3 Detailed frequency assignment criteria for DME are
provided in Annex 10, Volume I, 3.5.3.3 and Attachment C,
and in Annex 10, Volume V, 4.3.
Instrument landing system (ILS)
3. In the selection of frequencies for ILS the following
criteria are to be applied:
a) for co-channel: 175 NM;
b) for adjacent channel: 45 NM.
4. Detailed frequency assignment criteria for ILS are
provided in Annex 10, Volume I, 3.1.3.2 with related
guidance material in Attachment C, 3.5, and in Annex 10,
Volume V, 4.2.
* Based on 100 kHz channel spacing.