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procedure data into two separate databases: one for transmission in the approach azimuth sector, the other for transmission in
the back azimuth sector. Data for each procedure shall be transmitted in the database for the coverage sector in which the
procedure commences. Missed approach procedure data shall be included in the database containing the associated approach
procedure.
3.11.4.8.3.2.2 Procedure database structure. Where used, each procedure database shall be constructed as follows:
a) a map/CRC word shall identify the size of the database, the number of procedures defined, and the cyclic
redundancy check (CRC) code for validation of the database;
b) procedure descriptor words shall identify all named approach and departure procedures within the database; and
c) way-point data words shall define the location and sequence of way-points for the procedures.
Note.— The structure and coding of auxiliary B words B1 through B39 are defined in Appendix A, Tables A-14 through
A-17. Guidance material concerning the coding of MLS/RNAV procedures is given in Attachment G.
Chapter 3 Annex 10 — Aeronautical Communications
3-85 23/11/06
3.11.4.9 System accuracy. The accuracy standards specified herein shall be met on a 95 per cent probability basis
unless otherwise stated.
Note 1.— The overall error limits include errors from all causes such as those from airborne equipment, ground
equipment, and propagation effects.
Note 2.— It is intended that the error limits are to be applied over a flight path interval that includes the approach
reference datum or back azimuth reference datum. Information on the interpretation of MLS errors and the measurement of
these errors over an interval appropriate for flight inspection is provided in Attachment G, 2.5.2.
Note 3.— To determine the allowable errors for degradation allowances at points other than the appropriate reference
datum, the accuracy specified at the reference datum should first be converted from its linear value into its equivalent
angular value with an origin at the antenna.
3.11.4.9.1 MLS approach reference datum. The height of the MLS approach reference datum shall be 15 m (50 ft). A
tolerance of plus 3 m (10 ft) shall be permitted.
Note 1.— The operational objective of defining the height of the MLS approach reference datum is to ensure safe
guidance over obstructions and also safe and efficient use of the runway served. The heights noted in 3.11.4.9.1 assume Code
3 or Code 4 runways as defined by Annex 14.
Note 2.— At the same time, the reference datum is to provide a convenient point at which the accuracy and other
parameters of the function may be specified.
Note 3.— In arriving at the above height values for the MLS approach reference datum, a maximum vertical distance of
5.8 m (19 ft) between the path of the aircraft MLS antenna selected for final approach and the path of the lowest part of the
wheels at the threshold was assumed. For aircraft exceeding this criterion, appropriate steps may have to be taken either to
maintain adequate clearance at threshold or to adjust the permitted operating minima.
3.11.4.9.2 MLS back azimuth reference datum. The height of the MLS back azimuth reference datum shall be 15 m
(50 ft). A tolerance of plus 3 m (10 ft) shall be permitted.
Note.— The objective of defining the MLS back azimuth reference datum is to provide a convenient point at which the
accuracy and other parameters of the function may be specified.
3.11.4.9.3 The PFE shall be comprised of those frequency components of the guidance signal error at the output of the
airborne receiver which lie below 0.5 rad/s for azimuth guidance information or below 1.5 rad/s for elevation guidance
information. The control motion noise shall be comprised of those frequency components of the guidance signal error at the
output of the airborne receiver which lie above 0.3 rad/s for azimuth guidance or above 0.5 rad/s for elevation guidance
information. The output filter corner frequency of the receiver used for this measurement is 10 rad/s.
3.11.4.9.4 Approach azimuth guidance functions. At the approach reference datum, the approach azimuth function
shall provide performance as follows:
a) the PFE shall not be greater than plus or minus 6 m (20 ft);
b) the PFN shall not be greater than plus or minus 3.5 m (11.5 ft);
c) the CMN shall not be greater than plus or minus 3.2 m (10.5 ft) or 0.1 degree, whichever is less.
3.11.4.9.4.1 Recommendation.— At the approach reference datum, the PFE should not be greater than plus or minus
4 m (13.5 ft).
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-86
3.11.4.9.4.2 The linear accuracy specified at the reference datum shall be maintained throughout the runway coverage
　
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