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airspace users to have safe access to such reserved airspace. respect of the provisions of Appendix 5 ~ l a e dto 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
2.18 Aeronautid data Requirements for Aeronautical Information.
2.18.1 Determination and reporting of air traffic servicesrelated
aeronautical data shall be in accordance with the
accuracy and integrity requirements set forth in Tables 1 to 5
contained in Appendix 5 while taking into account the
established quality system procedures. Accuracy requirements
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 spacelfixes) and declared points
(e.g. flight information region boundary points).
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
24llU05
No. 43
Annex 11 - Air Tram Services Chapter 2
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.
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
delay:
Note 3.- For thosefixes andpoints that are serving a dual a) information on aerodrome conditions;
purpose, e.g. holding point and missed approach point, the b) the operational status of associated facilities, services
higher accuracy applies. and navigation aids within their area of responsibility;
2.19 Coordination between meteorologicaI
and air traffic semces 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 meteore
logical 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, Chapter 3, 3.5.1.
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 NOTAh4 and SIGMET messages is
　
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