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23/11/06 ATT G-14
Attachment G Annex 10 — Aeronautical Communications
which maximizes the union of the MLS elevation critical area and the ILS glide path critical area. This union will minimize
any enlargement of the combined critical areas. Due to the necessity to site the elevation antenna in front of the glide path,
the elevation antenna will normally have to be sited in the glide path critical area. For elevation antenna critical areas see
Section 4.3. For a description of the glide path critical area see Attachment C, Section 2.1.10.
4.1.1.2.7 Once the site for the elevation antenna has been identified, a location for the elevation antenna monitor must
be found. The elevation signal is to be monitored as stated in 2.4.3. The height of the elevation field monitor is dependent on
the use of integral monitoring of the minimum glide path and obstacle clearance criteria. The following considerations may
be helpful in determining a monitor location:
a) It is desirable to have the field monitor as close to the far field as practical to minimize near field effects on the
monitor. However, this distance is to be limited to avoid false alarms due to vehicle and aircraft traffic between the
field monitor and the antenna.
b) It is desirable to minimize blockage and distortion of the elevation signal by the monitor in the final approach
region. This may be achieved if the monitor location is offset up to 30 degrees from the elevation antenna boresight
and at distances from 40 m (130 ft) to 80 m (260 ft) depending on particular equipment designs.
c) The field monitor offset from the antenna boresight is to be limited to maintain the appropriate monitor sensitivity to
mechanical stability. It is not intended that the field monitor offset will exceed 30 degrees from the elevation
antenna boresight.
d) The elevation field monitor is to be sited to avoid affecting, or being affected by, the ILS glide path field monitor.
4.1.1.3 Siting the elevation antenna at a greater offset than the glide path
4.1.1.3.1 When siting the elevation antenna at offsets of 130 m (430 ft) to 180 m (590 ft) from runway centre line, the
conical effect on the achieved approach reference datum height becomes more prominent. Depending on the facility, the
elevation antenna setback may have to be adjusted to satisfy the criteria discussed in 4.1.1.2.1, 4.1.1.2.2 and 4.1.1.2.3.
4.1.1.3.2 When siting the elevation antenna at an offset from runway centre line greater than that of the resident glide
path, the elevation antenna should not penetrate the lateral pattern of the glide path. The value of Φ in Figure G-18 is
dependent on the type of glide path antenna present and the physical characteristics of the elevation equipment. In general,
“Φ” denotes the –10 dB point in the glide path antenna lateral pattern. The –10 dB value may be relaxed to –4 dB,
particularly for capture-effect glide path antennas, subject to verification of glide path signal quality.
4.1.1.3.3 After determining the acceptable range of elevation antenna locations based on the above criteria, this
location may have to be bounded further to satisfy obstacle limitation requirements in Annex 14, particularly taxiway-toobstacle
separation criteria.
4.1.1.4 Alternatives
4.1.1.4.1 If collocation of the elevation antenna with the glide path cannot readily be achieved, an alternative is to site
the elevation antenna on the opposite side of the runway.
4.1.2 MLS azimuth antenna
4.1.2.1 Introduction
4.1.2.1.1 When collocating the MLS azimuth antenna with the ILS localizer, one will have to make a series of
decisions which will determine the azimuth antenna location. Siting criteria have been developed based on minimizing the
ATT G-15 23/11/06
Annex 10 — Aeronautical Communications Volume I
effects of the MLS azimuth antenna equipment on the ILS localizer signal and vice versa. The criteria developed along with
signal-in-space, operation, critical areas, and obstacle clearance considerations will influence the final location of the azimuth
antenna. Since the presence of a humped runway or approach lighting system may require an increase in the azimuth antenna
phase centre height (PCH), these factors must be considered when applying any of the following criteria.
4.1.2.1.2 The purpose is to start with a general region for siting the azimuth antenna and then reduce this region to an
optimum location for a particular facility. This goal is achieved by stepping through a list of considerations shown as a logic
flow diagram in Figure G-20.
4.1.2.1.3 Referring to Figure G-20, the section numbers refer to one of the four siting geometries (i.e. 4.1.2.2
corresponds to “azimuth antenna sited ahead of the localizer antenna”, etc.). The numbers in each box reference a specific
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