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(see 3.11.4.8.3.2)
a) Number of approach azimuth procedure descriptors shall represent the total number of named approach and departure
procedures for which procedure descriptor words are transmitted in the approach azimuth coverage sector.
Note.— Missed approaches are not counted, as they do not use procedure descriptor words. Computed centre line
procedures to the primary runway are counted if a procedure descriptor is transmitted, even though associated waypoint
data are not transmitted in auxiliary words B1 to B39.
b) Number of back azimuth procedure descriptors shall represent the total number of named approach and departure
procedures for which procedure descriptor words are transmitted in the back azimuth coverage sector.
Note.— Missed approaches are not counted, as they do not use procedure descriptor words.
c) Last approach azimuth database word shall represent the address code of the last auxiliary data word within the range
B1 to B39 which is transmitted in the approach azimuth coverage sector, as defined by bits I13 to I18 of that word.
d) First back azimuth database word shall represent the address code of the first auxiliary data word within the range B1 to
B39 which is transmitted in the back azimuth coverage sector, as defined by bits I13 to I18 of that word.
e) Approach azimuth CRC code shall represent the coefficients of the cyclic redundancy check code for the approach
azimuth procedure database.
f) Back azimuth CRC code shall represent the coefficients of the cyclic redundancy check code for the back azimuth
procedure database.
g) Word B42 transmitted shall indicate whether auxiliary data word B42 is transmitted in lieu of word A1.
h) Word A4 transmitted shall indicate whether auxiliary data word A4 is transmitted.
i) Word B43 transmitted shall indicate whether auxiliary data word B43 is transmitted.
j) Back azimuth map/CRC indicator shall indicate whether auxiliary data word B39 is employed as a back azimuth
map/CRC word or as an approach azimuth waypoint data word.
k) Basic indicator shall represent the name of the first flown waypoint in an approach procedure, or the last flown waypoint
in a departure procedure. The name shall consist of five alpha characters coded in accordance with bits b1 to b5 of
International Alphabet No. 5.
l) Validity indicator shall represent the revision level of the approach or departure procedure. The validity indicator shall be
a number from 1 to 9.
m) Route indicator shall represent the route to or from the waypoint named by the basic indicator. The route indicator shall
be a single alpha character coded in accordance with bits b1 to b5 of International Alphabet No. 5. The letters “I” and “O”
shall not be used. Each of the 24 available route indicators shall be assigned not more than once within the combined set
of approach azimuth and back azimuth procedure descriptor words.
Note.— The restriction on the unique assignment of route indicators for MLS/RNAV operations is a departure from
normal route assignment practice necessary to enhance the integrity of procedure selection and reduce pilot workload.
23/11/06 APP A-16
Appendix A Annex 10 — Aeronautical Communications
n) Runway number shall represent the runway number as defined in Annex 14, Volume I, Chapter 5.
o) Runway letter shall represent the runway letter as defined in Annex 14, Volume I, Chapter 5, where used to differentiate
between parallel runways.
p) Procedure type shall indicate whether the procedure is an approach procedure or a departure procedure.
q) First waypoint index shall represent the sequential position, within the approach azimuth database or back azimuth
database, of the waypoint definition data for the first encoded waypoint of the procedure.
r) X coordinate shall represent the X coordinate of a given waypoint in the coordinate system defined.
s) Y coordinate follows shall indicate whether or not the Y coordinate is transmitted for a given waypoint. If the Y
coordinate is not transmitted, the Y coordinate is assumed to be zero.
t) Y coordinate shall represent the Y coordinate of a given waypoint in the coordinate system defined.
u) Z coordinate follows shall indicate whether or not the Z coordinate is transmitted for a given waypoint.
v) Z coordinate shall represent the Z coordinate of given waypoint in the coordinate system defined.
w) Next segment/field identifier shall indicate whether the next segment of a given procedure is straight or curved and
indicate which data fields follow the waypoint coordinates.
x) Threshold waypoint height shall represent the height of the primary runway threshold waypoint above the runway
threshold.
y) Virtual azimuth to waypoint distance shall represent the distance to the waypoint from the point to be considered as the
　
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