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for aeronautical data are based upon a 95 per cent confidence
level, and in that respect three types of positional data shall be
identified: surveyed points (e.g. navigation aids positions),
calculated points (mathematical calculations from the known
surveyed points of points in space, fixes) and declared points
(e.g. flight information region boundary points).
Note.- Specifications governing the quality system are
given in Annex 15, Chapter 3.
2.18.2 Contracting States shall ensure that integrity of
aeronautical data is maintained throughout the data process
from survey/origin to the next intended user. Aeronautical data
integrity requirements shall be based upon the potential risk
resulting from the comlption of data and upon the use to
which the data item is put. Consequently, the following
classification and data integrity level shall apply:
a) critical data, integrity level 1 x lo-': there is a high
probability when using corrupted critical data that the
continued safe flight and landing of an aircraft would be
severely at risk with the potential for catastrophe;
b) essential data, integrity level 1 x 10": there is a low
probability when using corrupted essential data that the
continued safe flight and landing of an aircraft would be
severely at risk with the potential for calastropl~e;a nd
c) routine data, integrity level 1 x there is a very low
probability when using corrupted routine data that the
continued safe flight and landing of an aircraft would be
severely at risk with the potential for catastrophe.
2.18.3 Protection of electronic aeronautical data while
stored or in transit shall be totally monitored by the cyclic
redundancy check (CRC). To achieve protection of the
integrity level of critical and essential aeronautical data as
classified in 2.18.2, a 32- or 24-bit CRC algorithm shall apply
respectively.
2.18.4 Recommendation.- To achieve protection of the
integrity level of routine aeronautical data as classified in
2.18.2, a 16-bit CRC algorithm should apply.
Note.- Guidance material on the aeronautical data quality
requirements (accuracy, resolution, integrity, protection and
traceability) is contained in the World Geodetic System -
1984 (WGS-84) Manual (Doc 9674). Supporting material in
respect of the provisions of Appendix 5 related to accuracy
and integrity of uerunuuticul h t u is cuntuined in RTCA Document
DO-2OIA and European Organization for Civil Aviation
Equipment (EUROCAE) Document ED-77 - Industry
Requirements for Aeronautical Information.
2.18.5 Geographical coordinates indicating latitude and
longitude shall be determined and reported to the aeronautical
information services authority in terms of the World Geodetic
System - 1984 (WGS-84) geodetic reference datum, identifying
those geographical coordinates which have been
transformed into WGS-84 coordinates bv mathematical means
and whose accuracy of original field work does not meet the
requirements in Appendix 5, Table 1.
2.18.6 The order of accuracy of the field work and
determinations and calculations derived therefrom shall be
such that the resulting operational navigation data for the
phases of flight will be within the maximum deviations, with
respect to an appropriate reference frame, ac indicated in the
tables contained in Appendix 5.
Note 1.- An appropriate reference frame is that which
enables WGS-84 to be realized on a given position and with
respect tu which all coordinate data are related.
Note 2.- Spec$cations governing the prcblication of
aeronautical data are given in Annex 4, Chapter 2 and
Annex 15, Chapter 3.
Annex I1 - Air Tmffic Services Chapter 2
Note 3.- For thosefixes andpoints that are serving a dual
purpose, e.g. holding point and missed approach point, the
higher accuracy applies.
2.19 Coordination between meteorological
and air traffic services authorities
2.19.1 To ensure that aircraft receive the most up-to-date
meteorological information for aircraft operations, arrangements
shall be made, where necessary, between meteorological
and air traffic services authorities for air traffic services
personnel:
a) in addition to using indicating instruments, to report, if
observed by air traffic services personnel or communicated
by aircraft, such other meteorological elements as
may be agreed upon;
b) to report as soon as possible to the associated meteorological
office meteo~logical phenomena of operational
significance, if observed by air traffic services personnel
or communicated by aircraft, which have not been
included in the aerodrome meteorological report;
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