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a) the required functional service radii of the facilities;
b) the maximum flight altitude of the aircraft using the
facilities;
C) the desirability of keeping the minimum IFR altitude as
low as the terrain will permit.
Note.- Guidance material on this subject is contained in
the Attachments to this Annex.
4.2.6 Recommendation.- To alleviate frequency
congestion problems at locations where two separate ILS
facilities serve opposite ends of the same runway or different
runways at the same airport, the assignment of identical ILS
localizer and glide path paired frequencies should be
permitted provided that:
a) the operational circumstances permit;
b) each localizer is assigned a different identiJication
signal; and
c) arrangements are made whereby the localizer and glide
path not in operational use cannot radiate.
Note.- The Standards in Volume 1, 3.1.2.7.2 and 3.1.3.9,
spec~jyth e equipment arrangements to be made.
Chapter 4 Annex 10 - Aeronautical Telecommunications
Table 4-2
Associated paired
Group DME channels VHF channels Remarks
Assignmenr
procedure
1 EVEN ILS 100 kHz spacings Would normally be used if a single DME is
18X to 56X paired with ILS and is part of MLS 1 2 EVEN ILS 50 kHz spacings
18Y to 56Y
3 EVEN VOR 50 kHz spacings
80Y to 1 18Y Odd tenths of a MHz
4 ODD VOR 50 kHz spacings
17Y to 55Y
5 ODD VOR 50 kHz spacings
81Y to 119Y Even tenths of a MHz
6 EVEN No associated paired
18W to 56W VHF channel
7 EVEN No associated paired
182 to 562 VHF channel
8 EVEN No associated paired
802 to 1 182 VHF channel
9 ODD No associated paired
172 to 552 VHF channel
10 ODD No associated paired
812 to 1192 VHF channel
for general use
(see 4.3.1)
for later use
(see 4.3.2)
Note.- DME channels in Groups I and 2 may be used in association with ILS andor MLS. DME channels in Groups 3,4
and 5 may be used in association with VOR or MLS.
4.3 Utilization in the band
960 - 1 215 MHz for DME
Note.- Guidance on the frequency planning of channels for
DME systems is given in Volume I, Attachment C, Section 7.
4.3.1 DME operating channels bearing the suffix "X" or
"Y" in Table A, Chapter 3 of Volume I shall be chosen on a
general basis without restriction.
Note.- The channel pairing plan provides for the use of
certain Y channels with either VOR or MLS. The guidance
material at Volume I, Attachment C, Section 7 includes specific
provisions relating to situations where the same, or adjacent
channel, is used in the same area for both systems.
4.3.2 DME channels bearing the suffix "W" or " Z in
Table A, Chapter 3 of Volume I, shall be chosen on the basis
of regional agreement when they become applicable in
accordance with the following:
a) for restricted regional use on or after, whichever is the
later:
1) 1 January 1989; or
2) a date prescribed by the Council giving a period of
two years or more following approval of the regional
agreement concerned;
b) for general use on or after, whichever is the later:
1) 1 January 1995; or
2) a date prescribed by the Council giving a period of
two years or more following approval of the regional
agreement concerned.
Note.- "Restricted use" is intended to refer to the limited
use of the channel by only suitably equipped aircraft and in
such a manner that:
Annex 10 - Aeronautical Telecommunications Volume V
a) the performance of existing DME equipment not capable
of operating on these multiplexed channels will be
protected from harmful interference;
b) a general requirement for the carriage of DME airborne
equipment capable of operating on these multiplexed
channels will not be imposed; and
c) operational service provided to international operators
using existing DME equipment without the multiplexed
channel capability is not derogated.
4.3.3 For regional assignment planning, the channels for
DME associated with MLS shall be selected from Table 4-2.
4.3.3.1 Groups I to 5. These DME channels shall be
permitted to be used generally. In selecting channels for
assignment purposes the following rules are applicable:
a) when an MLSDME is intended to operate on a runway
in association with an ILS, the DME channel, if
possible, shall be selected from Group 1 or 2 and paired
with the ILS frequency as indicated in the DME
channelling and pairing table in Table A of Volume I,
Chapter 3. In cases where the composite frequency
protection cannot be satisfied for all three components,
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