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seven words per minute, and shall be repeated at approximately equal intervals, not less than six times per minute, at all times
during which the localizer is available for operational use. When the transmissions of the localizer are not available for
operational use, as, for example, after removal of navigation components, or during maintenance or test transmissions, the
identification signal shall be suppressed. The dots shall have a duration of 0.1 second to 0.160 second. The dash duration
shall be typically three times the duration of a dot. The interval between dots and/or dashes shall be equal to that of one dot
plus or minus 10 per cent. The interval between letters shall not be less than the duration of three dots.
3.1.3.10 Siting
3.1.3.10.1 The localizer antenna system shall be located on the extension on the centre line of the runway at the stop
end, and the equipment shall be adjusted so that the course lines will be in a vertical plane containing the centre line of the
runway served. The antenna system shall have the minimum height necessary to satisfy the coverage requirements laid down
in 3.1.3.3, and the distance from the stop end of the runway shall be consistent with safe obstruction clearance practices.
3.1.3.11 Monitoring
3.1.3.11.1 The automatic monitor system shall provide a warning to the designated control points and cause one of the
following to occur, within the period specified in 3.1.3.11.3.1, if any of the conditions stated in 3.1.3.11.2 persist:
a) radiation to cease;
b) removal of the navigation and identification components from the carrier;
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-12
c) reversion to a lower category in the case of Facility Performance Categories II and III localizers where the reversion
requirement exists.
Note.— It is intended that the alternative of reversion offered in 3.1.3.11.1 may be used only if:
1) the safety of the reversion procedure has been substantiated; and
2) the means of providing information to the pilot on the change of category has adequate integrity.
3.1.3.11.2 The conditions requiring initiation of monitor action shall be the following:
a) for Facility Performance Category I localizers, a shift of the mean course line from the runway centre line equivalent
to more than 10.5 m (35 ft), or the linear equivalent to 0.015 DDM, whichever is less, at the ILS reference datum;
b) for Facility Performance Category II localizers, a shift of the mean course line from the runway centre line
equivalent to more than 7.5 m (25 ft) at the ILS reference datum;
c) for Facility Performance Category III localizers, a shift of the mean course line from the runway centre line
equivalent to more than 6 m (20 ft) at the ILS reference datum;
d) in the case of localizers in which the basic functions are provided by the use of a single-frequency system, a
reduction of power output to less than 50 per cent of normal, provided the localizer continues to meet the
requirements of 3.1.3.3, 3.1.3.4 and 3.1.3.5;
e) in the case of localizers in which the basic functions are provided by the use of a two-frequency system, a reduction
of power output for either carrier to less than 80 per cent of normal, except that a greater reduction to between 80 per
cent and 50 per cent of normal may be permitted, provided the localizer continues to meet the requirements of
3.1.3.3, 3.1.3.4 and 3.1.3.5;
Note.— It is important to recognize that a frequency change resulting in a loss of the frequency difference specified in
3.1.3.2.1 may produce a hazardous condition. This problem is of greater operational significance for Categories II and III
installations. As necessary, this problem can be dealt with through special monitoring provisions or highly reliable circuitry.
f) change of displacement sensitivity to a value differing by more than 17 per cent from the nominal value for the
localizer facility.
Note.— In selecting the power reduction figure to be employed in monitoring referred to in 3.1.3.11.2 e, particular
attention is directed to vertical and horizontal lobe structure (vertical lobing due to different antenna heights) of the
combined radiation systems when two carriers are employed. Large changes in the power ratio between carriers may result
in low clearance areas and false courses in the off-course areas to the limits of the vertical coverage requirements specified
in 3.1.3.3.1.
3.1.3.11.2.1 Recommendation.— In the case of localizers in which the basic functions are provided by the use of a
two-frequency system, the conditions requiring initiation of monitor action should include the case when the DDM in the
required coverage beyond plus or minus 10 degrees from the front course line, except in the back course sector, decreases
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