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runway and where a Facility Performance Category I — ILS is to be used for auto-coupled approaches and landings in
visual conditions an interlock should ensure that only the localizer serving the approach direction in use radiates, providing
the other localizer is not required for simultaneous operational use.
Note.— If both localizers radiate there is a possibility of interference to the localizer signals in the threshold region.
Additional guidance material is contained in 2.1.9 and 2.13 of Attachment C.
3.1.2.7.2 At locations where ILS facilities serving opposite ends of the same runway or different runways at the same
airport use the same paired frequencies, an interlock shall ensure that only one facility shall radiate at a time. When switching
from one ILS facility to another, radiation from both shall be suppressed for not less than 20 seconds.
Note.— Additional guidance material on the operation of localizers on the same frequency channel is contained in 2.1.9
of Attachment C and Volume V, Chapter 4.
3.1.3 VHF localizer and associated monitor
Introduction. The specifications in this section cover ILS localizers providing either positive guidance information over 360
degrees of azimuth, or providing such guidance only within a specified portion of the front coverage (see 3.1.3.7.4). Where
ILS localizers providing positive guidance information in a limited sector are installed, information from some suitably
located navigation aid, together with appropriate procedures, will generally be required to ensure that any misleading
guidance information outside the sector is not operationally significant.
3.1.3.1 General
3.1.3.1.1 The radiation from the localizer antenna system shall produce a composite field pattern which is amplitude
modulated by a 90 Hz and a 150 Hz tone. The radiation field pattern shall produce a course sector with one tone
predominating on one side of the course and with the other tone predominating on the opposite side.
3.1.3.1.2 When an observer faces the localizer from the approach end of a runway, the depth of modulation of the radio
frequency carrier due to the 150 Hz tone shall predominate on the observer’s right hand and that due to the 90 Hz tone shall
predominate on the observer’s left hand.
3.1.3.1.3 All horizontal angles employed in specifying the localizer field patterns shall originate from the centre of the
localizer antenna system which provides the signals used in the front course sector.
3.1.3.2 Radio frequency
3.1.3.2.1 The localizer shall operate in the band 108 MHz to 111.975 MHz. Where a single radio frequency carrier is
used, the frequency tolerance shall not exceed plus or minus 0.005 per cent. Where two radio frequency carriers are used, the
frequency tolerance shall not exceed 0.002 per cent and the nominal band occupied by the carriers shall be symmetrical about
the assigned frequency. With all tolerances applied, the frequency separation between the carriers shall not be less than 5 kHz
nor more than 14 kHz.
Chapter 3 Annex 10 — Aeronautical Communications
3-5 23/11/06
3.1.3.2.2 The emission from the localizer shall be horizontally polarized. The vertically polarized component of the
radiation on the course line shall not exceed that which corresponds to a DDM error of 0.016 when an aircraft is positioned
on the course line and is in a roll attitude of 20 degrees from the horizontal.
3.1.3.2.2.1 For Facility Performance Category II localizers, the vertically polarized component of the radiation on the
course line shall not exceed that which corresponds to a DDM error of 0.008 when an aircraft is positioned on the course line
and is in a roll attitude of 20 degrees from the horizontal.
3.1.3.2.2.2 For Facility Performance Category III localizers, the vertically polarized component of the radiation within
a sector bounded by 0.02 DDM either side of the course line shall not exceed that which corresponds to a DDM error of
0.005 when an aircraft is in a roll attitude of 20 degrees from the horizontal.
3.1.3.2.3 For Facility Performance Category III localizers, signals emanating from the transmitter shall contain no
components which result in an apparent course line fluctuation of more than 0.005 DDM peak to peak in the frequency band
0.01 Hz to 10 Hz.
3.1.3.3 Coverage
3.1.3.3.1 The localizer shall provide signals sufficient to allow satisfactory operation of a typical aircraft installation
within the localizer and glide path coverage sectors. The localizer coverage sector shall extend from the centre of the
localizer antenna system to distances of:
46.3 km (25 NM) within plus or minus 10 degrees from the front course line;
31.5 km (17 NM) between 10 degrees and 35 degrees from the front course line;
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