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classification and data integrity level shall apply:
a) critical data, integrity level 1 x 1p8: 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 I x lp5: 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 I x lp3: 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
respective1 y.
2.1.4 Recommendation. - To achieve protection 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, integngntyp,r otection 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 aeronautical data, is contained in RTCA.
Document DO-20lA and European Organization for Civil
Aviation Equipment (EUROCAE) Document ED-77, entitled
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, identifylng
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 5, Table A5-1.
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 5.
2.1.7 In addition to the elevation (referenced to mean sea
level) of the specific surveyed ground positions at aerodromes,
geoid undulation (referenced to the WGS-84 ellipsoid) for
those positions as indicated in Appendix 5, shall be determined
and reported to the aeronautical information services authority.
Note 1.- An appropriate reference fiame is that which
enables WGS-84 to be realized on a given aerodrome 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 Aerodrome reference point
2.2.1 An aerodrome reference point shall be established
for an aerodrome.
2.2.2 The aerodrome reference point shall be located near
the initial or planned geometric centre of the aerodrome and
shall normally remain where first established.
2.2.3 The position of the aerodrome reference point shall
be measured and reported to the aeronautical information
services authority in degrees, minutes and seconds.
ANNEX 14 - VOLUME I 2-1 2511 1/04
Volume I
2.3 Aerodrome and runway elevations
2.3.1 The aerodrome elevation and geoid undulation at the
aerodrome elevation position shall be measured to the accuracy
of one-half metre or foot and reported to the aeronautical
information services authority.
2.3.2 For an aerodrome used by international civil aviation
for non-precision approaches, the elevation and geoid undulation
of each threshold, the elevation of the runway end and
any significant high and low intermediate points along the
runway shall be measured to the accuracy of one-half metre or
foot and reported to the aeronautical information services
authority.
2.3.3 For precision approach runway, the elevation and
geoid undulation of the threshold, the elevation of the runway
end and the highest elevation of the touchdown zone shall be
measured to, the accuracy of one-quarter metre or foot and
reported to the aeronautical information services authority.
Note.- Geoid undulation must be measured in accordance
with the appropriate system of coordinates.
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