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referred to therein, form part of the associated
Standard or Recommended Practice and have the
same status.
2.- Material approved by the Council for publication in
association with the Standards and Recommended Practices:
a) Forewords comsprising historical and explanatory
material based on the action of the Council and
including an explanation of the obligations of States
with regard to the application of the Standards and
Recommended Practices ensuing from the
Convention and the Resolution of Adoption.
b) Introductions comprising explanatory material
introduced at the beginning of parts, chapters or
sections of the Annex to assist in the understanding
of the application of the text.
c) Notes included in the text, where appropriate, to give
factual information or references bearing on the
Standards or Recommended Practices in question,
but not constituting part of the Standards or
Recommended Practices.
d) Attachments comprising material supplementary to
the Standards and Recommended Practices, or
included as a guide to their application.
Selection of language
This Annex has been adopted in five languages - English,
Arabic, French, Russian and Spanish. Each Contracting State
is requested to select one of those texts for the purpose of
national implementation and for other effects provided for in
the Convention, either through direct use or through
translation into its own national language, and to notify the
Organization accordingly.
Editorial practices
The following practice has been adhered to in order to indicate
at a glance the status of each statement: Standards have been
printed in light face roman; Recommended Practices have
been printed in light face italics, the status being indicated by
the prefix Recommendation; Notes have been printed in light
face italics, the status being indicated by the prefix Note.
The following editorial practice has been followed in the
writing of specifications: for Standards the operative verb
"shall" is used, and for Recommended Practices the operative
verb "should" is used.
The units of measurement used in this document are .in
accordance with the International System of Units (SI) as
specified in Annex 5 to the Convention on International Civil
Aviation. Where Annex 5 permits the use of non-SI altemative
units these are shown in parentheses following the basic units.
Where two sets of units are quoted it must not be assumed that
the pairs of values are equal and interchangeable. It may,
however, be inferred that an equivalent level of safety is
achieved when either set of units is used exclusively.
Any reference to a portion of this document, which is
identified by a number andlor title, includes all subdivisions of
that portion.
25111104
No. 3
(viii)
Foreword Annex I4 -Aerodromes
Table A. Amendments to Annex 14, Volume 11
Amendment Source(s)
Adopted
Effective
Applicoble
1st Edition Fourth Meeting of the Physical characteristics; obstacle limitation surfaces; visual aids for visual 9 March 1990
ANC Helicopter meteorological conditions; rescue and fire fighting services. 30 July 1990
Operations Panel; 15 November 1990
Eleventh Meeting of the
ANC Visual Aids Panel
and Secretariat
1 Twelfth Meeting of the Standard geodetic reference system (WGS-84); fiangibiIity; visual aids for 13 March 1995
(2nd Edition) ANC Visual Aids Pane1 helicopter non-precision approaches; and visual alignment guidance system. 24 July 1995
and Secretariat 9 November 1995
2 Air Navigation Aeronautical data bases and vertical component of the World Geodetic 21 March 1997
Commission System - 1984 (WGS-84). 21 July 1997
6 November 1997
3 Fourteenth Meeting of Definitions of calendar, datum, Gregorian calendar and obstacle; common 27 February 2004
the ANC Visual Aids reference systems; heliport dimensions and related information; touchdown 12 July 2004
Panel and Secretariat and lift-off area lighting system; Appendix 1 - Aeronautical Data Quality 25 November 2004
Requirements.
2511 1/04
No. 3
INTERNATIONAL STANDARDS
AND RECOMMENDED PRACTICES
CHAPTER :L. GENERAL
Introductory Note.- Volume 11 of this Annex contains Cyclic redundancy check (CRC). A mathematical algorithm
Standards and Recommended Practices (specifications) that applied to the digital expression of data that provides a
prescribe the physical characteristics and obstacle limitation level of assurance against loss or alteration of data.
surfaces to be provided for at heliports, and certain facilities
and technical services normally provided at a heliport. It is Data qualitv. A degree or level of confidence that the data
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