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carrier signal strengths are approximately equal.
3.1.3.5.3.6 Recommendation.— The sum of the modulation depths of the radio frequency carrier due to the 90 Hz and
150 Hz tones should not exceed 60 per cent or be less than 30 per cent within the required coverage.
3.1.3.5.3.6.1 For equipment first installed after 1 January 2000, the sum of the modulation depths of the radio
frequency carrier due to the 90 Hz and 150 Hz tones shall not exceed 60 per cent or be less than 30 per cent within the
required coverage.
Note 1.— If the sum of the modulation depths is greater than 60 per cent for Facility Performance Category I
localizers, the nominal displacement sensitivity may be adjusted as provided for in 3.1.3.7.1 to achieve the above
modulation limit.
Chapter 3 Annex 10 — Aeronautical Communications
3-9 23/11/06
Note 2.— For two-frequency systems, the standard for maximum sum of modulation depths does not apply at or near
azimuths where the course and clearance carrier signal levels are equal in amplitude (i.e. at azimuths where both
transmitting systems have a significant contribution to the total modulation depth).
Note 3.— The standard for minimum sum of modulation depths is based on the malfunctioning alarm level being set as
high as 30 per cent as stated in 2.3.3 of Attachment C.
3.1.3.5.3.7 When utilizing a localizer for radiotelephone communications, the sum of the modulation depths of the
radio frequency carrier due to the 90 Hz and 150 Hz tones shall not exceed 65 per cent within 10 degrees of the course line
and shall not exceed 78 per cent at any other point around the localizer.
3.1.3.5.4 Recommendation.— Undesired frequency and phase modulation on ILS localizer radio frequency carriers
that can affect the displayed DDM values in localizer receivers should be minimized to the extent practical.
Note.— Relevant guidance material is given in 2.15 of Attachment C.
3.1.3.6 Course alignment accuracy
3.1.3.6.1 The mean course line shall be adjusted and maintained within limits equivalent to the following
displacements from the runway centre line at the ILS reference datum:
a) for Facility Performance Category I localizers: plus or minus 10.5 m (35 ft), or the linear equivalent of 0.015 DDM,
whichever is less;
b) for Facility Performance Category II localizers: plus or minus 7.5 m (25 ft);
c) for Facility Performance Category III localizers: plus or minus 3 m (10 ft).
3.1.3.6.2 Recommendation.— For Facility Performance Category II localizers, the mean course line should be
adjusted and maintained within limits equivalent to plus or minus 4.5 m (15 ft) displacement from runway centre line at the
ILS reference datum.
Note 1.— It is intended that Facility Performance Categories II and III installations be adjusted and maintained so that
the limits specified in 3.1.3.6.1 and 3.1.3.6.2 are reached on very rare occasions. It is further intended that design and
operation of the total ILS ground system be of sufficient integrity to accomplish this aim.
Note 2.— It is intended that new Category II installations are to meet the requirements of 3.1.3.6.2.
Note 3.— Guidance material on measurement of localizer course alignment is given in 2.1.4 of Attachment C.
3.1.3.7 Displacement sensitivity
3.1.3.7.1 The nominal displacement sensitivity within the half course sector at the ILS reference datum shall be
0.00145 DDM/m (0.00044 DDM/ft) except that for Category I localizers, where the specified nominal displacement
sensitivity cannot be met, the displacement sensitivity shall be adjusted as near as possible to that value. For Facility
Performance Category I localizers on runway codes 1 and 2, the nominal displacement sensitivity shall be achieved at the ILS
Point “B”. The maximum course sector angle shall not exceed 6 degrees.
Note.— Runway codes 1 and 2 are defined in Annex 14.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-10
3.1.3.7.2 The lateral displacement sensitivity shall be adjusted and maintained within the limits of plus or minus:
a) 17 per cent of the nominal value for Facility Performance Categories I and II;
b) 10 per cent of the nominal value for Facility Performance Category III.
3.1.3.7.3 Recommendation.— For Facility Performance Category II — ILS, displacement sensitivity should be
adjusted and maintained within the limits of plus or minus 10 per cent where practicable.
Note 1.— The figures given in 3.1.3.7.1, 3.1.3.7.2 and 3.1.3.7.3 are based upon a nominal sector width of 210 m (700 ft)
at the appropriate point, i.e. ILS Point “B” on runway codes 1 and 2, and the ILS reference datum on other runways.
Note 2.— Guidance material on the alignment and displacement sensitivity of localizers using two radio frequency
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