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N1 and N2 are the levels (dBm) of the two VHF FM sound broadcasting signals at the ILS localizer receiver input. Neither
level shall exceed the desensitization criteria set forth in 3.1.4.2.
Δf = 108.1 – f1, where f1 is the frequency of N1, the VHF FM sound broadcasting signal closer to 108.1 MHz.
3.1.4.2 After 1 January 1998, the ILS localizer receiving system shall not be desensitized in the presence of VHF FM
broadcast signals having levels in accordance with the following table:
Maximum level of unwanted
Frequency signal at receiver input
(MHz) (dBm)
88-102 +15
104 +10
106 +5
107.9 –10
Note 1.— The relationship is linear between adjacent points designated by the above frequencies.
Note 2.— Guidance material on immunity criteria to be used for the performance quoted in 3.1.4.1 and 3.1.4.2 is
contained in Attachment C, 2.2.9.
3.1.4.3 After 1 January 1995, all new installations of airborne ILS localizer receiving systems shall meet the provisions
of 3.1.4.1 and 3.1.4.2.
3.1.4.4 Recommendation.— Airborne ILS localizer receiving systems meeting the immunity performance standards of
3.1.4.1 and 3.1.4.2 should be placed into operation at the earliest possible date.
3.1.5 UHF glide path equipment and associated monitor
Note.— θ is used in this paragraph to denote the nominal glide path angle.
Chapter 3 Annex 10 — Aeronautical Communications
3-15 23/11/06
3.1.5.1 General
3.1.5.1.1 The radiation from the UHF glide path antenna system shall produce a composite field pattern which is
amplitude modulated by a 90 Hz and a 150 Hz tone. The pattern shall be arranged to provide a straight line descent path in
the vertical plane containing the centre line of the runway, with the 150 Hz tone predominating below the path and the 90 Hz
tone predominating above the path to at least an angle equal to 1.75 θ.
3.1.5.1.2 Recommendation.— The UHF glide path equipment should be capable of adjustment to produce a radiated
glide path from 2 to 4 degrees with respect to the horizontal.
3.1.5.1.2.1 Recommendation.— The ILS glide path angle should be 3 degrees. ILS glide path angles in excess of
3 degrees should not be used except where alternative means of satisfying obstruction clearance requirements are
impracticable.
3.1.5.1.2.2 The glide path angle shall be adjusted and maintained within:
a) 0.075 θ from θ for Facility Performance Categories I and II — ILS glide paths;
b) 0.04 θ from θ for Facility Performance Category III — ILS glide paths.
Note 1.— Guidance material on adjustment and maintenance of glide path angles is given in 2.4 of Attachment C.
Note 2.— Guidance material on ILS glide path curvature, alignment and siting, relevant to the selection of the height of
the ILS reference datum is given in 2.4 of Attachment C and Figure C-5.
3.1.5.1.3 The downward extended straight portion of the ILS glide path shall pass through the ILS reference datum at a
height ensuring safe guidance over obstructions and also safe and efficient use of the runway served.
3.1.5.1.4 The height of the ILS reference datum for Facility Performance Categories II and III — ILS shall be 15 m
(50 ft). A tolerance of plus 3 m (10 ft) is permitted.
3.1.5.1.5 Recommendation.— The height of the ILS reference datum for Facility Performance Category I — ILS
should be 15 m (50 ft). A tolerance of plus 3 m (10 ft) is permitted.
Note 1.— In arriving at the above height values for the ILS reference datum, a maximum vertical distance of 5.8 m (19 ft)
between the path of the aircraft glide path antenna and the path of the lowest part of the wheels at the threshold was assumed.
For aircraft exceeding this criterion, appropriate steps may have to be taken either to maintain adequate clearance at
threshold or to adjust the permitted operating minima.
Note 2.— Appropriate guidance material is given in 2.4 of Attachment C.
3.1.5.1.6 Recommendation.— The height of the ILS reference datum for Facility Performance Category I — ILS used on
short precision approach runway codes 1 and 2 should be 12 m (40 ft). A tolerance of plus 6 m (20 ft) is permitted.
3.1.5.2 Radio frequency
3.1.5.2.1 The glide path equipment shall operate in the band 328.6 MHz to 335.4 MHz. Where a single radio frequency
carrier is used, the frequency tolerance shall not exceed 0.005 per cent. Where two carrier glide path systems 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 4 kHz
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