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nor more than 32 kHz.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-16
3.1.5.2.2 The emission from the glide path equipment shall be horizontally polarized.
3.1.5.2.3 For Facility Performance Category III — ILS glide path equipment, signals emanating from the transmitter
shall contain no components which result in apparent glide path fluctuations of more than 0.02 DDM peak to peak in the
frequency band 0.01 Hz to 10 Hz.
3.1.5.3 Coverage
3.1.5.3.1 The glide path equipment shall provide signals sufficient to allow satisfactory operation of a typical aircraft
installation in sectors of 8 degrees in azimuth on each side of the centre line of the ILS glide path, to a distance of at least
18.5 km (10 NM) up to 1.75 θ and down to 0.45 θ above the horizontal or to such lower angle, down to 0.30 θ, as required to
safeguard the promulgated glide path intercept procedure.
3.1.5.3.2 In order to provide the coverage for glide path performance specified in 3.1.5.3.1, the minimum field strength
within this coverage sector shall be 400 microvolts per metre (minus 95 dBW/m2). For Facility Performance Category I glide
paths, this field strength shall be provided down to a height of 30 m (100 ft) above the horizontal plane containing the
threshold. For Facility Performance Categories II and III glide paths, this field strength shall be provided down to a height of
15 m (50 ft) above the horizontal plane containing the threshold.
Note 1.— The requirements in the foregoing paragraphs 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 2.2.5 of Attachment C.
Note 3.— Material concerning reduction in coverage outside 8 degrees on each side of the centre line of the ILS glide
path appears in 2.4 of Attachment C.
3.1.5.4 ILS glide path structure
3.1.5.4.1 For Facility Performance Category I — ILS glide paths, bends in the glide path shall not have amplitudes
which exceed the following:
Amplitude (DDM)
Zone (95% probability)
Outer limit of coverage
to ILS Point “C” 0.035
3.1.5.4.2 For Facility Performance Categories II and III — ILS glide paths, bends in the glide path shall not have
amplitudes which exceed the following:
Amplitude (DDM)
Zone (95% probability)
Outer limit of coverage
to ILS Point “A” 0.035
ILS Point “A” to 0.035 at ILS Point “A”
ILS Point “B” decreasing at a linear rate
to 0.023 at ILS Point “B”
ILS Point “B” to the
ILS reference datum 0.023
Chapter 3 Annex 10 — Aeronautical Communications
3-17 23/11/06
Note 1.— The amplitudes referred to in 3.1.5.4.1 and 3.1.5.4.2 are the DDMs due to bends as realized on the mean ILS
glide path correctly adjusted.
Note 2.— In regions of the approach where ILS glide path curvature is significant, bend amplitudes are calculated from
the mean curved path, and not the downward extended straight line.
Note 3.— Guidance material relevant to the ILS glide path course structure is given in 2.1.5 of Attachment C.
3.1.5.5 Carrier modulation
3.1.5.5.1 The nominal depth of modulation of the radio frequency carrier due to each of the 90 Hz and 150 Hz tones
shall be 40 per cent along the ILS glide path. The depth of modulation shall not deviate outside the limits of 37.5 per cent to
42.5 per cent.
3.1.5.5.2 The following tolerances shall be applied to the frequencies of the modulating tones:
a) the modulating tones shall be 90 Hz and 150 Hz within 2.5 per cent for Facility Performance Category I — ILS;
b) the modulating tones shall be 90 Hz and 150 Hz within 1.5 per cent for Facility Performance Category II — ILS;
c) the modulating tones shall be 90 Hz and 150 Hz within 1 per cent for Facility Performance Category III — ILS;
d) the total harmonic content of the 90 Hz tone shall not exceed 10 per cent: additionally, for Facility Performance
Category III equipment, the second harmonic of the 90 Hz tone shall not exceed 5 per cent;
e) the total harmonic content of the 150 Hz tone shall not exceed 10 per cent.
3.1.5.5.2.1 Recommendation.— For Facility Performance Category I — ILS, the modulating tones should be 90 Hz and
150 Hz within plus or minus 1.5 per cent where practicable.
3.1.5.5.2.2 For Facility Performance Category III glide path equipment, the depth of amplitude modulation of the radio
frequency carrier at the power supply frequency or harmonics, or at other noise frequencies, shall not exceed 1 per cent.
3.1.5.5.3 The modulation shall be phase-locked so that within the ILS half glide path sector, the demodulated 90 Hz
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