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XWN (MAXIMUM VALUE)
XW
X
D
LOCALIZER
AZIMUTH ANTENNA
PHASE CENTRE
RUNWAY
ZLOC H
Z Z = 2.5m
ZDH
0.6ZDH
DECISION
HEIGHT
H = 3 1 + D 0.06D - DZ
4 X X
Z =
Z
-
Z
N
LOC
(D,
X,
and
Z
are
in
metres)
N
W
WN
Figure G-22. Azimuth phase centre height requirement when siting an
azimuth antenna behind an ILS localizer
23/11/06 ATT G-84
Attachment G Annex 10 — Aeronautical Communications
10 m
(33 ft)
10 m
(33 ft)
Sensitive area
RUNWAY
CENTRE LINE
Flight path deviation
allowance (0.2°)
To field monitor pole as required
Azimuth
antenna
CRITICAL AREA
TO RUNWAY
STOP END
See Table G-12A
PLAN VIEW
PROFILE VIEW
RUNWAY
* MEASURED HORIZONTALLY FROM
AZIMUTH ANTENNA
** MEASURED VERTICALLY FROM BOTTOM
OF AZIMUTH ANTENNA APERTURE
BW = BEAMWIDTH
*
X m (ft)
**
m (ft)
**
m (ft)
30 (100) 1.1 (3.5) 5.7 (18.6)
75 (250) 2.7 (8.7) 10.5 (34.3)
150 (500) 5.3 (17.5) 17.1 (56.2)
225 (750) 7.5 (24.5) 23.2 (76.0)
300 (1 000) 8.6 (28.3) 28.9 (94.8)
Where:
= 0.035 X X < 200m
= 2 0.06 X X > 200m
= X tan 3° + 3 0.06 X
4.6 m
(15 ft)
Azimuth
antenna
As required to
protect field
monitor
200 m
(656 ft)
1.7 BW
VALUE FOR a and b
1.7 BW
X
2 x Fresnel
zone radius
3 x Fresnel
zone radius
2°
3°
Figure G-23. Typical azimuth critical and sensitive areas
ATT G-85 23/11/06
Annex 10 — Aeronautical Communications Volume I
75 m
(250 ft)
RUNWAY
ELEVATION
ANTENNA
10 m
(33 ft)
10 m
(33 ft)
TO FIELD MONITOR AS REQUIRED
L
(See Table below)
B-747 B-727 B-747 B-727
320 m
(1 050 ft)
170 m
(560 ft)
180 m
(600 ft)
385 m
(1 260 ft)
400 m
(1 310 ft)
250 m
(820 ft)
300 m
(990 ft)
565 m
(1 860 ft)
CLEAN SITE COMPLEX SITE
PLAN VIEW
PROFILE VIEW
THIS VOLUME EXISTS ONLY
WHERE APPROACH PROCEDURES
FOR MULTIPLE ELEVATION
ANGLES ARE APPROVED
ELEVATION
ANTENNA
AS REQUIRED TO
PROTECT FIELD MONITOR
MINIMUM
GLIDE PATH
MAXIMUM ELEVATION ANGLE FOR
WHICH AN APPROVED APPROACH
PROCEDURE EXISTS
1.7 BW
1.7 BW
MAX GP
MIN GP
($1.0°)
FLIGHT PATH DEVIATION
ALLOWANCE (0.2°)
BEAMWIDTH
1.0°
1.5°
Figure G-24. Typical elevation critical and sensitive areas/volume
23/11/06 ATT G-86
Attachment G Annex 10 — Aeronautical Communications
CRITICAL AREA
SENSITIVE AREA, B-727
(STATIONARY AIRCRAFT PROHIBITED)
SENSITIVE AREA, B-747
(STATIONARY AIRCRAFT PROHIBITED)
See plan view of Figure G-23
for monitor and near-field
protection
See Table G-12 B
300 m
Note.— Profile view is shown in Figure G-23.
APPROACH TRACK
Figure G-25. Typical azimuth critical and sensitive areas
for offset azimuth installation
ATT G-87 23/11/06
Annex 10 — Aeronautical Communications Volume I
A
B
C
D
F
3°
G
A D
C
B
L*
L*
L*
G X
X
See 4.3.7.2.2
RUNWAY
1.7 BW + flight path
deviation allowance (0.2°)
DH (MAP)
300 m (1 000 ft)
BW = Beamwidth Not to scale
*See 4.3.7.2.1
CRITICAL AREA
SENSITIVE AREA
Figure G-26. Typical azimuth critical and sensitive areas/volume
for the computed centre line procedure
23/11/06 ATT G-88
Attachment G Annex 10 — Aeronautical Communications
PCH
3°
STANDARD STRAIGHT-IN
APPROACH CRITICAL AREA
OFF-CENTRELINE CRITICAL
AREA REQUIREMENT
SENSITIVE AREA
BW = Beamwidth
Sensitive
Runway area
stop end
Azimuth
antenna
Azimuth
antenna
See Table G-13
1.73 W
1.7 BW
1.7 BW
1.73 W
Taxiway
See plan view
on Figure G-23
for monitor and
near-field protection
PROFILE VIEW
PLAN VIEW
Plan view
of approach
Flight path deviation
allowance (0.2°)
Minimum height surface
applies to this region only
Proportional coverage limit
Protected by centreline
Critical and sensitive areas (Figure G-23)
　
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