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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.
2.1.2 Contracting States shall ensure that integrity of
aeronautical data is maintained throughout the data process
from surveylorigin to the next intended user. Aeronautical data
integrity requirements shall be based upon the potential risk
resulting from the corruption 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 1Q8: 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 1Q5: 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 catastrophe; and
c) routine data, integrity level 1 x 1Q3: 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.
2.1.3 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 2.1.2, a 32- or 24-bit CRC algorithm shall apply
respectively.
2.1.4 Recommendation.- To achieve vrotection of the
integrity level of routine aeronautical data as classified in
2.1.2, 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 1 related to accuracy
and integrity of aeronautical data, is contained in RTCA
Document DO-201A and European Organization for Civil
Aviation Equipment (EUROCAE) Document ED-77 -
Industry Requirements for Aeronautical Information.
2.1.5 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 by mathematical means
and whose accuracy of original field work does not meet the
requirements in Appendix 1, Table 1.
2.1.6 The order of accuracy of the field work 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, as indicated in tables
contained in Appendix 1.
2.1.7 In addition to the elevation (referenced to mean sea
level) of the specific surveyed ground positions at heliports,
geoid undulation (referenced to the WGS-84 ellipsoid) for
those positions as indicated in Appendix 1, shall be determined
and reported to the aeronautical information services authority.
Note 1.- An appropriate reference frame is that which
enables WGS-84 to be realized on a given heliport and with
respect to which all coordinate data are related.
Note 2.- Specifications governing the publication of WGS-
84 coordinates are given in Annex 4, Chapter 2, and Annex 15,
Chapter 3.
2.2 Heliport reference point
2.2.1 A heliport reference point shall be established for a
heliport not co-located with an aerodrome.
Note.- When the heliport is co-located with an aerodrome,
the established aerodrome reference point serves both
aerodrome and heliport.
2.2.2 The heliport reference point shall be located near
the initial or planned geometric centre of the heliport and shall
normally remain where first established.
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4 ANNEX 14 - VOLUME 11
Chapter 2 Annex 14 -Aerodromes
2.2.3 The position of the heliport reference point shall be
measured and reported to the aeronautical information services
authority in degrees, minutes and seconds.
2.3 Heliport elevation
2.3.1 The heliport elevation and geoid undulation at the
heliport elevation position shall be measured and reported to
the aeronautical infohation services authority to the accuracy
of one-half metre or foot.
2.3.2 For a heliport used by international civil aviation,
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