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setback as required
4.1.1.3.1
Are critical areas
acceptable?
4.1.1.2.6
Are critical areas
acceptable?
4.1.1.2.6
Alternatives
4.1.1.4
Is monitor site
acceptable?
4.1.1.2.7
Is monitor site
acceptable?
4.1.1.2.7
Runway threshold
Site elevation
antenna
Site elevation
antenna
NO NO
NO NO
NO
NO NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Glide path
antenna
Figure G-17. Elevation/glide path logic flow diagram
ATT G-79 23/11/06
Annex 10 — Aeronautical Communications Volume I
FRESNEL ZONE
MIGRATION REGION
RUNWAY
OS min.
GLIDE PATH ANTENNA
TYPICALLY 180 m (590 ft)
1 2
ACCEPTABLE ELEVATION ANTENNA REGION
Figure G-18. Elevation antenna regions for collocation
with ILS (3° minimum glide path)
23/11/06 ATT G-80
Attachment G Annex 10 — Aeronautical Communications
OS
EL
SB
PLAN VIEW
PROFILE VIEW
RPCH
ARDH
SB = ARDH-RPCH
tan Q
Figure G-19. Elevation siting parameters
ATT G-81 23/11/06
Annex 10 — Aeronautical Communications Volume I
23/11/06 ATT G-82
Figure G-20. Azimuth/localizer logic flow diagram
Signal in space
consideration
ILS collocation
W/ILS localizer
required?
Verify collocation
criteria,
section 4.2
Is an approach
lighting system
present?
Section 4.1.2.2
Azimuth ahead of
ILS localizer
Section 4.1.2.4
Integrated azimuth/
localizer
Section 4.1.2.3
Azimuth behind
localizer
Is azimuth-localizer
spacing acceptable?
4.1.2.2.1
Is obstacle
clearance above
localizer satisfied?
4.1.2.4.1.1
Is spacing and AZ
height acceptable?
4.1.2.3.1
AZ blockage by ILS
monitor pole?
4.1.2.3.2
Are obstacle
requirements
satisfied W/DME?
Determine localizer 4.1.2.2.2
height above AZ
4.1.2.4.1.2
AZ blockage by ILS
monitor pole?
4.1.2.4.3
Are obstacle
requirements
satisfied W/DME?
4.1.2.2.2
Are critical areas
acceptable?
4.1.2.2.3
Is monitor site
acceptable?
4.1.2.2.4
Are critical areas
acceptable?
4.1.2.2.3
Are obstacle requirements
satisfied?
4.1.2.2.2
Are critical areas
acceptable?
4.1.2.2.3
Is monitor site
acceptable?
4.1.2.2.4
Site azimuth
antenna if a monitor
site can be found
4.1.2.2.4
Are obstacle
requirements
satisfied W/OUT
DME?
Site antenna
or
consider options
Runway stop end
Localizer array
For offset azimuth
siting considerations
see section 4.1.2.5
Adjust phase
centre height
as required
Adjust phase
centre height
as required
Are obstacle requirements
satisfied
W/OUT DME?
Site antenna
or
consider options
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Attachment G Annex 10 — Aeronautical Communications
*
*
*
*
*
* *
*
55° 20° 0° 20° 40°
Front and back
course case
9m
6m
3m
3m
³ 3m
30m 30m
X
Localizer array
X determined by
obstacle clearance
criteria
3m
6m
9m
55° 20° 0° 40°
Front course case
STOP END
OFFSET AZIMUTH SITING
AREA 1: Recommended siting positions
(Directly abeam)
AREA 2: No measurable effects on
Localizer front course
AREA 3: Measurable degradation to
Localizer front course signal
or Azimuth signals
Shows additional requirement when
Localizer back course is utilized
Unacceptable degradation to
Localizer signal in these areas
AZIMUTH LOCATIONS
GROUND MOUNTED
INTEGRATED
ELEVATED
(w/o LOC Back course)
ELEVATED
(w or w/o LOC Back course)
: SEE LEGEND ON THE LEFT
CENTERLINE
OFFSET
•••
•
Figure G-21. Azimuth antenna regions for collocation with ILS
ATT G-83 23/11/06
Annex 10 — Aeronautical Communications Volume I
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