Annex 3. Издание 16. AMENDMENT No. 74

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Annex 3. Издание 16

AMENDMENT No. 74

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COVER SHEET TO AMENDMENT 74 INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES METEOROLOGICAL SERVICE FOR INTERNATIONAL AIR NAVIGATION PART I CORE SARPS PART II APPENDICES AND ATTACHMENTS ANNEX 3 TO THE CONVENTION ON INTERNATIONAL CIVIL AVIATION SIXTEENTH EDITION JULY 2007 INTERNATIONAL CIVIL AVIATION ORGANIZATION

Checklist of Amendments to Annex 3 Effective date Date of applicability Sixteenth Edition incorporates Amendments 174 16 July 2007 7 November 2007 Amendment 74 adopted by the Council on 21 February 2007 Replacement pages 6-1 and 6-2, 9-1 and 9-2, APP 1-2, APP 2-3, APP 3-3, APP 3-6 to APP 3-29, APP 5-2 to APP 5-8, APP 5-10 to APP 5-13, APP 5-18, and APP 8-4. 16 July 2007 5 November 2008

16/7/07 Transmittal note Amendment 74 to the International Standards and Recommended Practices METEOROLOGICAL SERVICE FOR INTERNATIONAL AIR NAVIGATION Annex 3 to the Convention on International Civil Aviation 1. Insert the following replacement pages in Annex 3 Sixteenth Edition to incorporate Amendment 74 which becomes applicable on 5 November 2008 a Pages 6-1 and 6-2 Chapter 6 b Pages 9-1 and 9-2 Chapter 9 c Page APP 1-2 Appendix 1 d Pages APP 2-3 Appendix 2 e Pages APP 3-3, APP 3-6 to APP 3-29 Appendix 3 f Pages APP 5-2 to APP 5-8, APP 5-10 to APP 5-13, and APP 5-18 Appendix 5 g Pages APP 8-4 Appendix 8 2. Record the entry of this amendment on page ii.

ANNEX 3 6-1 7/11/07 5/11/08 No. 74 CHAPTER 6. FORECASTS Note. Technical specifications and detailed criteria related to this chapter are given in Appendix 5. 6.1 Interpretation and use of forecasts 6.1.1 Owing to the variability of meteorological elements in space and time, to limitations of forecasting techniques and to limitations caused by the definitions of some of the elements, the specific value of any of the elements given in a forecast shall be understood by the recipient to be the most probable value which the element is likely to assume during the period of the forecast. Similarly, when the time of occurrence or change of an element is given in a forecast, this time shall be understood to be the most probable time. Note. Guidance on the operationally desirable accuracy of forecasts is given in Attachment B. 6.1.2 The issue of a new forecast by a meteorological office, such as a routine aerodrome forecast, shall be understood to cancel automatically any forecast of the same type previously issued for the same place and for the same period of validity or part thereof. 6.2 Aerodrome forecasts 6.2.1 An aerodrome forecast shall be prepared by the meteorological office designated by the meteorological authority concerned. 6.2.2 An aerodrome forecast shall be issued at a specified time and consist of a concise statement of the expected meteorological conditions at an aerodrome for a specified period. 6.2.3 Aerodrome forecasts and amendments thereto shall be issued as TAF and include the following information in the order indicated a identification of the type of forecast b location indicator c time of issue of forecast d identification of a missing forecast, when applicable e date and period of validity of forecast f identification of a cancelled forecast, when applicable g surface wind h visibility i weather

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