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below 0.155.
3.1.3.11.3 The total period of radiation, including period(s) of zero radiation, outside the performance limits specified
in a), b), c), d), e) and f) of 3.1.3.11.2 shall be as short as practicable, consistent with the need for avoiding interruptions of
the navigation service provided by the localizer.
Chapter 3 Annex 10 — Aeronautical Communications
3-13 23/11/06
3.1.3.11.3.1 The total period referred to under 3.1.3.11.3 shall not exceed under any circumstances:
10 seconds for Category I localizers;
5 seconds for Category II localizers;
2 seconds for Category III localizers.
Note 1.— The total time periods specified are never-to-be-exceeded limits and are intended to protect aircraft in the final
stages of approach against prolonged or repeated periods of localizer guidance outside the monitor limits. For this reason,
they include not only the initial period of outside tolerance operation but also the total of any or all periods of outside
tolerance radiation including period(s) of zero radiation, which might occur during action to restore service, for example, in
the course of consecutive monitor functioning and consequent changeover(s) to localizer equipment 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.
3.1.3.11.3.2 Recommendation.— Where practicable, the total period under 3.1.3.11.3.1 should be reduced so as not
to exceed two seconds for Category II localizers and one second for Category III localizers.
3.1.3.11.4 Design and operation of the monitor system shall be consistent with the requirement that navigation
guidance and identification will be removed and a warning 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 Attachment C, 2.1.8.
3.1.3.11.5 Any erroneous navigation signals on the carrier occurring during removal of navigation and identification
components in accordance with 3.1.3.11.1 b) shall be suppressed within the total periods allowed in 3.1.3.11.3.1.
Note.— To prevent hazardous fluctuations in the radiated signal, localizers employing mechanical modulation equipment
may require suppression of navigation components during modulator rundown.
3.1.3.12 Integrity and continuity of service requirements
3.1.3.12.1 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 localizers.
3.1.3.12.2 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 localizers.
3.1.3.12.3 The probability of not losing the radiated guidance signal shall be greater than:
a) 1 – 2 × 10–6 in any period of 15 seconds for Facility Performance Category II localizers or localizers intended to be
used for Category III A operations (equivalent to 2 000 hours mean time between outages); and
b) 1 – 2 × 10–6 in any period of 30 seconds for Facility Performance Category III localizers intended to be used for the
full range of Category III operations (equivalent to 4 000 hours mean time between outages).
3.1.3.12.4 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 localizers (equivalent to 1 000 hours mean time between outages).
Note.— Guidance material on integrity and continuity of service is given in Attachment C, 2.8.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-14
3.1.4 Interference immunity performance for ILS localizer receiving systems
3.1.4.1 After 1 January 1998, the ILS localizer receiving system shall provide adequate immunity to interference from
two-signal, third-order intermodulation products caused by VHF FM broadcast signals having levels in accordance with the
following:
2N1 + N2 + 72 ≤ 0
for VHF FM sound broadcasting signals in the range 107.7 – 108.0 MHz
and
2 1 2 3 24 20 log 0
0.4
N N f
+ + ⎜⎛ − Δ ⎟⎞≤
⎝ ⎠
for VHF FM sound broadcasting signals below 107.7 MHz,
where the frequencies of the two VHF FM sound broadcasting signals produce, within the receiver, a two-signal, third-order
intermodulation product on the desired ILS localizer frequency.
　
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