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Figure C-6. ILS wave forms illustrating relative audio phasing of the 90 Hz and 150 Hz tones
23/11/06 ATT C-24
Attachment C Annex 10 — Aeronautical Communications
Figure C-7. Localizer coverage with
respect to azimuth
Figure C-9. Difference in depth of
modulation and displacement sensitivity
Figure C-8. Localizer coverage with
respect to elevation
Figure C-10. Glide path coverage
Course line
10°
10°
25°
25°
18.5 km
(10 NM)
31.5 km
(17 NM)
Centre of localizer
antenna system
Centre of localizer
antenna system
When topographical features dictate or operational requirements
and alternative navigation facilities permit, the following coverage
may be provided:
Course line 10°
10°
25°
25°
18.5 km
Note.— If coverage as prescribed in Chapter 3, 3.1.3.3.1 is required outside
the plus or minus 35-degree sector, this is provided to 18.5 km (10 NM),
as indicated by the broken arc above.
46.3 km (25 NM)
18.5 km
(10 NM)
3 3.4 km
(18 NM)
(10 NM)
P
or
D = Distances and azimuths specified in 3.1.3.3.1
Note.— The point P is either 600 metres (2 000 ft) above the elevation of the
threshold, or 300 metres (1 000 ft) above the elevation of the highest point within
the intermediate and final approach areas, whichever is the higher.
7°
300 m
(1 000 ft)
600 m
(2 000 ft)
(See Note)
D
8°
8°
Centre line
R
18.5 km (10 NM)
(a) Azimuthal cover
(b) Elevation cover
R
Back course
(if provided)
Centre of
localizer
antenna
system
(-90°)
(+90°)
DDM 0.155
(if coverage provided)
Û
DDM 0.155
(if coverage provided)
Û
DDM Û 0.155
DDM = 0.155
DDM = 0.155
DDM = 0
DDM Û 0.155
25°
25°
ILS
reference datum
10°
10°
C
A B
A — Course sector 6 degrees
B — Displacement sensitivity = 0.00145 DDM/metre (0.00044 DDM/foot)
at the ILS reference datum
Ý
C — DDM increases linearly from zero to value of 0.180, and then Û0.180
ATT C-25 23/11/06
Annex 10 — Aeronautical Communications Volume I
DDM = 0
A
C
B
Category I
Category II Category III
DDM = 0
DDM = 0.0875
DDM = 0.0875
q
DDM = 0.0875
DDM = 0
DDM = 0.0875
DDM = 0.0875
DDM = 0
DDM = 0.0875
Note.— Figure C-11 depicts the tolerances for the radiated space pattern specified in Chapter 3, 3.1.5.6; however, this space pattern should not be interpreted as being
representative of any one particular ground equipment. In this connection, it should be noted that there are several known types of ILS glide path ground equipment having
different characteristics but which can satisfy the requirements of Chapter 3, 3.1.5.6. Therefore, wherever there is a requirement to know the tolerances applicable to a specific
equipment, reference should be made to the manufacturer’s technical data rather than the ICAO systems specification.
Figure C-11. Glide path — difference in depth of modulation
23/11/06 ATT C-26
Attachment C Annex 10 — Aeronautical Communications
DDM = 0
Nominal
glide path
Monitoring provisions of Chapter 3, 3.1.5.7.1 a) Monitoring provisions of Chapter 3, 3.1.5.7.1 d)
Monitoring provisions of Chapter 3, 3.1.5.7.1 e) Monitoring provisions of Chapter 3, 3.1.5.7.1 f)
Change of displacement
sensitivity by more than
25% from normal
DDM = 0.0875
DDM = 0
DDM = 0.0875
DDM = 0
DDM = 0
DDM = 0.0875
Note.— The broken lines represent the permissible limits of deviation before monitoring action is required.
Figure C-12. Glide path monitoring provisions
ATT C-27 23/11/06
Annex 10 — Aeronautical Communications Volume I
2.6 Deployment of ILS frequencies
2.6.1 In using the figures listed in Table C-1, it must be noted that these are related to ensuring freedom from
interference to a point at the protection height and at the limit of service distance of the ILS in the direction of the front beam.
If there is an operational requirement for back beam use, the criteria would also be applied to a similar point in the back beam
direction. Frequency planning will therefore need to take into account the localizer azimuthal alignment. It is to be noted that
the criteria must be applied in respect of each localizer installation, in the sense that while of two localizers, the first may not
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