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with IA-5 using seven information bits, plus one even parity bit added to each character. Alphanumeric data shall be transmitted
in the order in which they are to be read. The serial transmission of a character shall be with the lower order bit transmitted first
and the parity bit transmitted last.
Note 1.— International Alphabet No. 5 (IA5) is defined in Annex 10, Volume III.
Note 2.— Auxiliary data A contents are specified in 3.11.4.8.3.1. Auxiliary data B contents are specified in 3.11.4.8.3.2.
Auxiliary data C contents are reserved for national use.
3.11.4.8.3.1 Auxiliary data A content. The data items contained in auxiliary data words A1 through A4 as specified in
Appendix A, Table A-10 shall be defined as follows:
a) Approach azimuth antenna offset shall represent the minimum distance between the approach azimuth antenna phase
centre and a vertical plane containing the runway centre line.
b) Approach azimuth antenna to MLS datum point distance shall represent the minimum distance between the approach
azimuth antenna phase centre and the vertical plane perpendicular to the runway centre line which contains the MLS
datum point.
c) Approach azimuth alignment with runway centre line shall represent the minimum angle between the zero-degree
approach azimuth and the runway centre line.
d) Approach azimuth antenna coordinate system shall represent the coordinate system (planar or conical) of the angle
data transmitted by the approach azimuth antenna.
Note.— Although the above Standard has been developed to provide for alternate coordinate systems, the
planar coordinate system is not implemented and it is not intended for future implementation.
e) Approach azimuth antenna height shall represent the vertical location of the antenna phase centre with respect to the
MLS datum point.
f) Approach elevation antenna offset shall represent the minimum distance between the elevation antenna phase centre
and a vertical plane containing the runway centre line.
g) MLS datum point to threshold distance shall represent the distance measured along the runway centre line from the
MLS datum point to the runway threshold.
h) Approach elevation antenna height shall represent the vertical location of the elevation antenna phase centre with
respect to the MLS datum point.
i) MLS datum point elevation shall represent the datum point elevation relative to mean sea level (msl).
j) Runway threshold height shall represent the vertical location of the intersection of the runway threshold and centre
line with respect to the MLS datum point.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-84
k) DME offset shall represent the minimum distance between the DME antenna phase centre and a vertical plane
containing the runway centre line.
l) DME to MLS datum point 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.
m) DME antenna height shall represent the vertical location of the antenna phase centre with respect to the MLS datum
point.
n) Runway stop-end distance shall represent the distance along centre line between the runway stop-end and the MLS
datum point.
o) Back azimuth antenna offset shall represent the minimum distance between the back azimuth antenna phase centre
and a vertical plane containing the runway centre line.
p) Back azimuth to MLS datum point distance shall represent the minimum distance between the back azimuth antenna
and the vertical plane perpendicular to the runway centre line which contains the MLS datum point.
q) Back azimuth alignment with runway centre line shall represent the minimum angle between the zero-degree back
azimuth and the runway centre line.
r) Back azimuth antenna coordinate system shall represent the coordinate system (planar or conical) of the angle data
transmitted by the back azimuth antenna.
Note.— Although the above Standard has been developed to provide for alternate coordinate systems, the
planar coordinate system is not implemented and it is not intended for future implementation.
s) Back azimuth antenna height shall represent the vertical location of the antenna phase centre with respect to the
MLS datum point.
Note.— It is intended that no additional auxiliary data A words be defined.
3.11.4.8.3.2 Auxiliary data B content. Auxiliary data B words shall be defined as specified in Appendix A, Tables A-11
and A-13.
3.11.4.8.3.2.1 Microwave landing system/area navigation (MLS/RNAV) procedure data. Where required, auxiliary data
words B1 through B39 shall be used to transmit data to support MLS/RNAV procedures. It shall be permissible to divide this
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