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and indicator equipment;
e) a wider proportional guidance sector exceeding the minimum specified in 3.11.5.
Note 1.— Although the Standard has been developed to provide for flare elevation function, this function is not
implemented and is not intended for future implementation.
Note 2.— The MLS signal format allows further system growth to include additional functions, such as 360 degrees
azimuth.
3.11.3.4 Simplified MLS configurations. It shall be permissible to derive simplified configurations from the basic MLS
(3.11.3.1), by relaxation of characteristics as follows:
a) an approach azimuth coverage provided in approach region (3.11.5.2.2.1.1) only;
b) an approach azimuth and elevation coverage (3.11.5.2.2 and 3.11.5.3.2) not extending below a height of 30 m
(100 ft) above the threshold;
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-76
c) accuracy limits for PFE and PFN expanded to be not greater than 1.5 times the values specified in 3.11.4.9.4 for
approach azimuth guidance and in 3.11.4.9.6 for elevation guidance;
d) ground equipment contribution to the mean course error and to the mean glide path error expanded to be 1.5 times
the values specified in 3.11.5.2.4 and 3.11.5.3.4, respectively;
e) CMN requirements (3.11.4.9.4 and 3.11.4.9.6) waived; and
f) monitor and control action period (3.11.5.2.3 and 3.11.5.3.3) expanded to a six-second period.
Note.— Guidance material on application of the simplified MLS configurations is provided in Attachment G, 15.
3.11.4 Signal-in-space characteristics — angle and data functions
3.11.4.1 Channelling
3.11.4.1.1 Channel arrangement. The MLS angle and data functions shall operate on any one of the 200 channels
assigned on the frequencies from 5 031.0 MHz to 5 090.7 MHz as shown in Table A.
3.11.4.1.1.1 Channel assignments in addition to those specified in 3.11.4.1.1 shall be made within the 5 030.4 to
5 150.0 MHz sub-band as necessary to satisfy future air navigation requirements.
3.11.4.1.2 Channel pairing with DME. The channel pairing of the angle and data channel with the channel of the
ranging function shall be in accordance with Table A.
3.11.4.1.3 Frequency tolerance. The operating radio frequency of the ground equipment shall not vary more than plus
or minus 10 kHz from the assigned frequency. The frequency stability shall be such that there is no more than a plus or minus
50 Hz deviation from the nominal frequency when measured over a one-second interval.
3.11.4.1.4 Radio frequency signal spectrum
3.11.4.1.4.1 The transmitted signal shall be such that, during the transmission time, the mean power density above a
height of 600 m (2 000 ft) shall not exceed –94.5 dBW/m2 for angle guidance or data signals, as measured in a 150 kHz
bandwidth centred 840 kHz or more from the nominal frequency.
3.11.4.1.4.2 The transmitted signal shall be such that, during the transmission time, the mean power density beyond a
distance of 4 800 m (2.6 NM) from any antennas and for a height below 600 m (2 000 ft) shall not exceed –94.5 dBW/m² for
angle guidance or data signals, as measured in a 150 kHz bandwidth centred 840 kHz or more from the nominal frequency.
Note 1.— Requirements in 3.11.4.1.4.2 are applicable when the operational coverage of another MLS ground station has
overlap with the radio-horizon of the considered ground station.
Note 2.— Guidance material on MLS frequency planning is provided in Attachment G, 9.3.
3.11.4.2 Polarization. The radio frequency transmissions from all ground equipment shall be nominally vertically
polarized. The effect of any horizontally polarized component shall not cause the guidance information to change by more
than 40 per cent of the PFE allowed at that location with the airborne antenna rotated 30 degrees from the vertical position or
cause the PFE limit to be exceeded.
Chapter 3 Annex 10 — Aeronautical Communications
3-77 23/11/06
3.11.4.3 Time-division-multiplex (TDM) organization
3.11.4.3.1 Both angle information and data shall be transmitted by TDM on a single radio frequency channel.
3.11.4.3.2 Synchronization. The transmissions from the various angle and data ground equipment serving a particular
runway shall be time synchronized to assure interference-free operations on the common radio frequency channel of
operation.
3.11.4.3.3 Function rates. Each function transmitted shall be repeated at the rates shown in the following table:
Function
Average rate (Hz) measured over
any 10-second period
Approach azimuth guidance 13 ± 0.5
High rate approach azimuth guidance 39 ± 1.5
Back azimuth guidance 6.5 ± 0.25
Approach elevation guidance 39 ± 1.5
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