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Note.— See Attachment C, Figure C-1.
ILS reference datum (Point “T”). A point at a specified height located above the intersection of the runway centre line and
the threshold and through which the downward extended straight portion of the ILS glide path passes.
Two-frequency glide path system. An ILS glide path in which coverage is achieved by the use of two independent radiation
field patterns spaced on separate carrier frequencies within the particular glide path channel.
Two-frequency localizer system. A localizer system in which coverage is achieved by the use of two independent radiation
field patterns spaced on separate carrier frequencies within the particular localizer VHF channel.
Chapter 3 Annex 10 — Aeronautical Communications
3-3 23/11/06
3.1.2 Basic requirements
3.1.2.1 The ILS shall comprise the following basic components:
a) VHF localizer equipment, associated monitor system, remote control and indicator equipment;
b) UHF glide path equipment, associated monitor system, remote control and indicator equipment;
c) VHF marker beacons, or distance measuring equipment (DME) in accordance with section 3.5, together with
associated monitor system and remote control and indicator equipment.
Note.— Guidance material relative to the use of DME as an alternative to the marker beacon component of the ILS is
contained in Attachment C, 2.11.
3.1.2.1.1 Facility Performance Categories I, II and III — ILS shall provide indications at designated remote control
points of the operational status of all ILS ground system components.
Note 1.— It is intended that the air traffic services unit involved in the control of aircraft on the final approach be one of
the designated control points receiving, without delay, information on the operational status of the ILS as derived from the
monitors.
Note 2.— It is intended that the air traffic system is likely to call for additional provisions which may be found essential
for the attainment of full operational Category III capability, e.g. to provide additional lateral and longitudinal guidance
during the landing roll-out, and taxiing, and to ensure enhancement of the integrity and reliability of the system.
3.1.2.2 The ILS shall be constructed and adjusted so that, at a specified distance from the threshold, similar
instrumental indications in the aircraft represent similar displacements from the course line or ILS glide path as appropriate,
irrespective of the particular ground installation in use.
3.1.2.3 The localizer and glide path components specified in 3.1.2.1 a) and b) which form part of a Facility
Performance Category I — ILS shall comply at least with the Standards in 3.1.3 and 3.1.5 respectively, excepting those in
which application to Facility Performance Category II — ILS is prescribed.
3.1.2.4 The localizer and glide path components specified in 3.1.2.1 a) and b) which form part of a Facility
Performance Category II — ILS shall comply with the Standards applicable to these components in a Facility Performance
Category I — ILS, as supplemented or amended by the Standards in 3.1.3 and 3.1.5 in which application to Facility
Performance Category II — ILS is prescribed.
3.1.2.5 The localizer and glide path components and other ancillary equipment specified in 3.1.2.1.1, which form part
of a Facility Performance Category III — ILS, shall otherwise comply with the Standards applicable to these components in
Facility Performance Categories I and II — ILS, except as supplemented by the Standards in 3.1.3 and 3.1.5 in which
application to Facility Performance Category III — ILS is prescribed.
3.1.2.6 To ensure an adequate level of safety, the ILS shall be so designed and maintained that the probability of
operation within the performance requirements specified is of a high value, consistent with the category of operational
performance concerned.
Note.— The specifications for Facility Performance Categories II and III — ILS are intended to achieve the highest
degree of system integrity, reliability and stability of operation under the most adverse environmental conditions to be
encountered. Guidance material to achieve this objective in Categories II and III operations is given in 2.8 of Attachment C.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-4
3.1.2.7 At those locations where two separate ILS facilities serve opposite ends of a single runway, an interlock shall
ensure that only the localizer serving the approach direction in use shall radiate, except where the localizer in operational use
is Facility Performance Category I — ILS and no operationally harmful interference results.
3.1.2.7.1 Recommendation.— At those locations where two separate ILS facilities serve opposite ends of a single
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