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shall be less than 10 microseconds.
3.11.4.8 Data functions. Provision shall be made in the MLS signal format for the transmission of basic data and
auxiliary data.
Note.— Ground equipment data coverage and monitoring requirements are specified in 3.11.5.4.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-82
3.11.4.8.1 Data transmission. Data shall be transmitted as specified in 3.11.4.4.3.1.
3.11.4.8.2 Basic data structure and timing. Basic data shall be encoded as 32-bit words consisting of a function
preamble (12 bits) specified in 3.11.4.4, and data content as specified in Appendix A, Table A-7. The timing of the basic data
words shall be as specified in Appendix A, Table A-6. The content, maximum interval between transmission of the same word
and organization of the words shall be as specified in Appendix A, Table A-7. Data containing digital information shall be
transmitted with the least significant bit first. The smallest binary number shall represent the lower absolute range limit with
increments in binary steps to the upper absolute range limit specified in Appendix A, Table A-7.
3.11.4.8.2.1 Basic data contents. The data items specified in Appendix A, Table A-7 shall be defined as follows:
a) Approach azimuth antenna to threshold distance shall represent the minimum distance between the approach
azimuth antenna phase centre to the vertical plane perpendicular to the centre line which contains the runway
threshold.
b) Approach azimuth proportional coverage limit shall represent the limit of the sector in which proportional approach
azimuth guidance is transmitted.
c) Clearance signal type shall indicate the method of providing the azimuth clearance signal.
d) Minimum glide path shall represent the lowest angle of descent along the zero-degree azimuth as defined in 3.11.1.
e) Back azimuth status shall represent the operational status of the back azimuth equipment.
f) DME status shall represent the operational status of the DME equipment.
g) Approach azimuth status shall represent the operational status of the approach azimuth equipment.
h) Approach elevation status shall represent the operational status of the approach elevation equipment.
i) Beamwidth shall represent, for a particular function, the antenna beamwidth as defined in 3.11.1.
j) DME distance shall represent the minimum distance between the DME antenna phase centre and the vertical plane
perpendicular to the runway centre line which contains the MLS datum point.
k) Approach azimuth magnetic orientation shall represent the angle measured in the horizontal plane clockwise from
Magnetic North to the zero-degree approach azimuth, originating from the approach azimuth antenna. The vertex of
the measured angle shall be the approach azimuth antenna phase centre.
l) Back azimuth magnetic orientation shall represent the angle measured in the horizontal plane clockwise from
Magnetic North to the zero-degree back azimuth, originating from the back azimuth antenna. The vertex of the
measured angle shall be the back azimuth antenna phase centre.
m) Back azimuth proportional coverage limit shall represent the limit of the sector in which proportional back azimuth
guidance is transmitted.
n) MLS ground equipment identification shall represent the last three characters of the system identification specified in
3.11.4.6.2.1. The characters shall be encoded in accordance with International Alphabet No. 5 (IA-5) using bits b1
through b6.
Note 1.— International Alphabet No. 5 (IA-5) is defined in Annex 10, Volume III.
Note 2.— Bit b7 of this code may be reconstructed in the airborne receiver by taking the complement of bit b6.
Chapter 3 Annex 10 — Aeronautical Communications
3-83 23/11/06
3.11.4.8.3 Auxiliary data organization and timing. Auxiliary data shall be organized into 76-bit words consisting of the
function preamble (12 bits) as specified in 3.11.4.4, the address (8 bits) as specified in Appendix A, Table A9, and data content
and parity (56 bits) as specified in Appendix A, Tables A-10, A-11, A-12, A-13 and A-15. Three function identification codes
are reserved to indicate transmission of auxiliary data A, auxiliary data B and auxiliary data C. The timing of the auxiliary data
function shall be as specified in Appendix A, Table A-8. Two auxiliary data word formats shall be provided, one for digital data
and one for alphanumeric character data. Data containing digital information shall be transmitted with the least significant bit
first. Alpha characters in data words B1 through B39 shall be encoded in accordance with International Alphabet No. 5 (IA5)
using bits b1 to b5 with b1 transmitted first. Alphanumeric data characters in other data words shall be encoded in accordance
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