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18.5 km (10 NM) outside of plus or minus 35 degrees if coverage is provided;
except that, where topographical features dictate or operational requirements permit, the limits may be reduced to 33.3 km
(18 NM) within the plus or minus 10-degree sector and 18.5 km (10 NM) within the remainder of the coverage when
alternative navigational facilities provide satisfactory coverage within the intermediate approach area. The localizer signals
shall be receivable at the distances specified at and above a height of 600 m (2 000 ft) above the elevation of the threshold, or
300 m (1 000 ft) above the elevation of the highest point within the intermediate and final approach areas, whichever is the
higher. Such signals shall be receivable, to the distances specified, up to a surface extending outward from the localizer
antenna and inclined at 7 degrees above the horizontal.
Note.— Guidance material on localizer coverage is given in 2.1.11 of Attachment C.
3.1.3.3.2 In all parts of the coverage volume specified in 3.1.3.3.1, other than as specified in 3.1.3.3.2.1, 3.1.3.3.2.2 and
3.1.3.3.2.3, the field strength shall be not less than 40 microvolts per metre (minus 114 dBW/m2).
Note.— This minimum field strength is required to permit satisfactory operational usage of ILS localizer facilities.
3.1.3.3.2.1 For Facility Performance Category I localizers, the minimum field strength on the ILS glide path and within
the localizer course sector from a distance of 18.5 km (10 NM) to a height of 60 m (200 ft) above the horizontal plane containing
the threshold shall be not less than 90 microvolts per metre (minus 107 dBW/m2).
3.1.3.3.2.2 For Facility Performance Category II localizers, the minimum field strength on the ILS glide path and within
the localizer course sector shall be not less than 100 microvolts per metre (minus 106 dBW/m2) at a distance of 18.5 km (10 NM)
increasing to not less than 200 microvolts per metre (minus 100 dBW/m2) at a height of 15 m (50 ft) above the horizontal plane
containing the threshold.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-6
3.1.3.3.2.3 For Facility Performance Category III localizers, the minimum field strength on the ILS glide path and
within the localizer course sector shall be not less than 100 microvolts per metre (minus 106 dBW/m2) at a distance of
18.5 km (10 NM), increasing to not less than 200 microvolts per metre (minus 100 dBW/m2) at 6 m (20 ft) above the
horizontal plane containing the threshold. From this point to a further point 4 m (12 ft) above the runway centre line, and
300 m (1 000 ft) from the threshold in the direction of the localizer, and thereafter at a height of 4 m (12 ft) along the length
of the runway in the direction of the localizer, the field strength shall be not less than 100 microvolts per metre (minus
106 BW/m2).
Note.— The field strengths given in 3.1.3.3.2.2 and 3.1.3.3.2.3 are necessary to provide the signal-to-noise ratio
required for improved integrity.
3.1.3.3.3 Recommendation.— Above 7 degrees, the signals should be reduced to as low a value as practicable.
Note 1.— The requirements in 3.1.3.3.1, 3.1.3.3.2.1, 3.1.3.3.2.2 and 3.1.3.3.2.3 are based on the assumption that the
aircraft is heading directly toward the facility.
Note 2.— Guidance material on significant airborne receiver parameters is given in 2.2.2 and 2.2.4 of Attachment C.
3.1.3.3.4 When coverage is achieved by a localizer using two radio frequency carriers, one carrier providing a radiation
field pattern in the front course sector and the other providing a radiation field pattern outside that sector, the ratio of the two
carrier signal strengths in space within the front course sector to the coverage limits specified at 3.1.3.3.1 shall not be less
than 10 dB.
Note.— Guidance material on localizers achieving coverage with two radio frequency carriers is given in the Note to
3.1.3.11.2 and in 2.7 of Attachment C.
3.1.3.3.5 Recommendation.— For Facility Performance Category III localizers, the ratio of the two carrier signal
strengths in space within the front course sector should not be less than 16 dB.
3.1.3.4 Course structure
3.1.3.4.1 For Facility Performance Category I localizers, bends in the course line shall not have amplitudes which
exceed the following:
Amplitude (DDM)
Zone (95% probability)
Outer limit of coverage to
ILS Point “A” 0.031
ILS Point “A” to 0.031 at ILS Point “A”
ILS Point “B” decreasing at a linear rate to
0.015 at ILS Point “B”
ILS Point “B” to
ILS Point “C” 0.015
3.1.3.4.2 For Facility Performance Categories II and III localizers, bends in the course line shall not have amplitudes
　
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