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by the data items in A1, for azimuth, and A4, for back azimuth. At a facility with the approach azimuth rotation greater than +20.47°, B42 is transmitted
in place of A1. At a facility with the back azimuth rotation greater than +20.47°, B43 is transmitted in place of A4.
8. All spare bits are set to ZERO.
Table A-11. Definitions of auxiliary data B items
(see 3.11.4.8.3.2)
Note.— Definitions of auxiliary data B items supporting MLS/RNAV procedures are shown in Table A-13.
a) Latitude of MLS datum point shall be the latitude coordinate of the MLS datum point as defined by the World Geodetic
System — 1984 (WGS-84) reference ellipsoid, coordinate system and associated datum.
b) Longitude of the MLS datum point shall be the longitude coordinate of the MLS datum point as defined by the same
reference ellipsoid, coordinate system, and datum noted in item a).
c) Vertical coordinate of the MLS datum point shall be the vertical coordinate of the MLS datum point as defined by the
same reference ellipsoid, coordinate system, and datum noted in item a).
Note.— Although WGS-84 has been approved as the ICAO Standard for geographical coordinates indicating
latitude and longitude, introduction of vertical WGS-84 coordinates is pending. Until this introduction, an elevation
referenced to mean sea level (msl) can continue to be used.
d) Approach azimuth true north orientation shall represent the angle measured in the horizontal plane clockwise from True
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.
e) Runway visual range (RVR) shall represent measurement of instrument RVR at touchdown zone, mid-point and stop end
of the runway together with the trend indication, provided in accordance with Annex 3, Chapter 4.
f) Surface wind shall represent wind speed and wind direction (magnetic), provided in accordance with Annex 3, Chapter 4.
g) 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.
h) 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 and containing the MLS
datum point.
Appendix A Annex 10 — Aeronautical Communications
i) Approach azimuth alignment with runway centre line shall represent the minimum angle between the zero-degree
approach azimuth and the runway centre line.
j) Approach azimuth antenna height shall represent the vertical location of the antenna phase centre with respect to the
MLS datum point.
k) 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.
l) Back azimuth antenna 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.
m) Back azimuth alignment with runway centre line shall represent the minimum angle between the zero-degree back
azimuth and the runway centre line.
n) Back azimuth antenna height shall represent the vertical location of the antenna phase centre with respect to the MLS
datum point.
o) Primary runway number shall represent the primary runway number as defined in Annex 14, Volume I, Chapter 5.
p) Primary runway letter shall represent the primary runway letter as defined in Annex 14, Volume I, Chapter 5, where
used to differentiate between parallel runways.
q) Secondary runway number shall represent the secondary runway number as defined in Annex 14, Volume I, Chapter 5.
r) Secondary runway letter shall represent the secondary runway letter as defined in Annex 14, Volume I, Chapter 5, where
used to differentiate between parallel runways.
s) Elevation guidance to secondary runway shall indicate whether or not elevation guidance may be used to the secondary
runway, and if so, whether it is directly usable as a raw angle or requires computed glide path.
t) Minimum glide path to secondary runway shall represent the lowest angle of descent along the secondary runway centre
line.
u) Approach azimuth alignment with secondary runway centre line shall represent the minimum angle between the zerodegree
approach azimuth and the secondary runway centre line.
v) Secondary runway threshold X coordinate shall represent the minimum distance between the secondary runway
threshold and the vertical plane perpendicular to the primary runway centre line containing the MLS datum point.
w) Secondary runway threshold Y coordinate shall represent the minimum distance between the secondary runway
　
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