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example, in the course of consecutive monitor functioning and consequent changeovers to glide path equipments or elements
thereof.
Note 2.— From an operational point of view, the intention is that no guidance outside the monitor limits be radiated
after the time periods given, and that no further attempts be made to restore service until a period in the order of 20 seconds
has elapsed.
3.1.5.7.3.2 Recommendation.— Where practicable, the total period specified under 3.1.5.7.3.1 for Categories II and
III — ILS glide paths should not exceed 1 second.
3.1.5.7.4 Design and operation of the monitor system shall be consistent with the requirement that radiation shall cease
and a warning shall be provided at the designated remote control points in the event of failure of the monitor system itself.
Note.— Guidance material on the design and operation of monitor systems is given in 2.1.8 of Attachment C.
3.1.5.8 Integrity and continuity of service requirements
3.1.5.8.1 The probability of not radiating false guidance signals shall not be less than 1 – 0.5 × 10–9 in any one landing
for Facility Performance Categories II and III glide paths.
3.1.5.8.2 Recommendation.— The probability of not radiating false guidance signals should not be less than
1 – 1.0 × 10–7 in any one landing for Facility Performance Category I glide paths.
3.1.5.8.3 The probability of not losing the radiated guidance signal shall be greater than 1 – 2 × 10–6 in any period of
15 seconds for Facility Performance Categories II and III glide paths (equivalent to 2 000 hours mean time between outages).
Chapter 3 Annex 10 — Aeronautical Communications
3-21 23/11/06
3.1.5.8.4 Recommendation.— The probability of not losing the radiated guidance signal should exceed 1 – 4 × 10–6 in
any period of 15 seconds for Facility Performance Category I glide paths (equivalent to 1 000 hours mean time between
outages).
Note.— Guidance material on integrity and continuity of service is given in 2.8 of Attachment C.
3.1.6 Localizer and glide path frequency pairing
3.1.6.1 The pairing of the runway localizer and glide path transmitter frequencies of an instrument landing system shall
be taken from the following list in accordance with the provisions of Volume V, Chapter 4, 4.2:
Localizer Glide path
(MHz) (MHz)
108.1 334.7
108.15 334.55
108.3 334.1
108.35 333.95
108.5 329.9
108.55 329.75
108.7 330.5
108.75 330.35
108.9 329.3
108.95 329.15
109.1 331.4
109.15 331.25
109.3 332.0
109.35 331.85
109.5 332.6
109.55 332.45
109.7 333.2
109.75 333.05
109.9 333.8
109.95 333.65
110.1 334.4
110.15 334.25
110.3 335.0
110.35 334.85
110.5 329.6
110.55 329.45
110.7 330.2
110.75 330.05
110.9 330.8
110.95 330.65
111.1 331.7
111.15 331.55
111.3 332.3
111.35 332.15
111.5 332.9
111.55 332.75
111.7 333.5
111.75 333.35
111.9 331.1
111.95 330.95
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-22
3.1.6.1.1 In those regions where the requirements for runway localizer and glide path transmitter frequencies of an
instrument landing system do not justify more than 20 pairs, they shall be selected sequentially, as required, from the
following list:
Sequence
number
Localizer
(MHz)
Glide path
(MHz)
1 110.3 335.0
2 109.9 333.8
3 109.5 332.6
4 110.1 334.4
5 109.7 333.2
6 109.3 332.0
7 109.1 331.4
8 110.9 330.8
9 110.7 330.2
10 110.5 329.6
11 108.1 334.7
12 108.3 334.1
13 108.5 329.9
14 108.7 330.5
15 108.9 329.3
16 111.1 331.7
17 111.3 332.3
18 111.5 332.9
19 111.7 333.5
20 111.9 331.1
3.1.6.2 Where existing ILS localizers meeting national requirements are operating on frequencies ending in even tenths
of a megahertz, they shall be reassigned frequencies, conforming with 3.1.6.1 or 3.1.6.1.1 as soon as practicable and may
continue operating on their present assignments only until this reassignment can be effected.
3.1.6.3 Existing ILS localizers in the international service operating on frequencies ending in odd tenths of a megahertz
shall not be assigned new frequencies ending in odd tenths plus one twentieth of a megahertz except where, by regional
agreement, general use may be made of any of the channels listed in 3.1.6.1 (see Volume V, Chapter 4, 4.2).
3.1.7 VHF marker beacons
3.1.7.1 General
a) There shall be two marker beacons in each installation except as provided in 3.1.7.6.6. A third marker beacon may
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