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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 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.
2.18.5 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 by 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
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Annex 11 — Air Traffic Services Chapter 2
1/11/01 2-8
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 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 to which all coordinate data are related.
Note 2.— Specifications governing the publication of
aeronautical data are given in Annex 4, Chapter 2 and
Annex 15, Chapter 3.
Note 3.— For those fixes and points 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 meteorological 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;
c) to report as soon as possible to the associated
meteorological office pertinent information concerning
pre-eruption volcanic activity, volcanic eruptions and
information concerning volcanic ash cloud. In addition,
area control centres and flight information centres shall
report the information to the associated meteorological
watch office and volcanic ash advisory centres (VAACs).
Note 1.— VAACs are designated by regional air navigation
agreements in accordance with Annex 3, 3.6.1.
Note 2.— See 4.2.3 regarding transmission of special
air-reports.
2.19.2 Close coordination shall be maintained between
area control centres, flight information centres and associated
meteorological watch offices to ensure that information on
volcanic ash included in NOTAM and SIGMET messages is
consistent.
2.20 Coordination between
aeronautical information services and
air traffic services authorities
2.20.1 To ensure that aeronautical information services
units obtain information to enable them to provide up-to-date
pre-flight information and to meet the need for in-flight
information, arrangements shall be made between aeronautical
information services and air traffic services authorities
responsible for air traffic services to report to the responsible
aeronautical information services unit, with a minimum of
　
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