INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES Annex 3 Fourteenth Edition Corrigeildum No. 2 English/Arabic/Russian/ Spanish 19/10/01 METEOROLOGICAL SERVICE FOR INTERNATIONAL AIR NAVIGATION ANNEX 3 TO THE CONVENTION ON INTERNATIONAL CIVIL AVIATION FOURTEENTH EDITION - JULY 2001 CORRIGENDUM NO. 2 1. Please replace existing page APP 2-10, dated 1/11/01, by the attached new page bearing the notation "Con 2". 2. Record the entry of this corrigendum on page iij.
Appendix 2 Alzncx 3 - Meteorological Service for Inteniationul Air Vavigution 7. To be included if the one-minute RVR values during the 10-minute period immediately preceding the observation vary from the mean value more than 50 rn or more than 20 per cent whichever is greater the one-minute mean minimum and the one-minute mean maximum values are reported instead of the 10-minute mean value 8. To be included if the RVR values during the lil-minute period preceding the observation have shown a distinct tendency such that the mean RVR durlng the first 5 minutes varies by 100 m cr more from the mean during the second 5 minutes of the period. No tendency indication where not available. 9. To be included whenever applicable. 10. One or more, up to a maximum of three groups. 11. To be included whenever applicable. No qualifier for moderate Intensity only qualifier "t" i.e. well-developed to be dsed with PO and FC. 12. Precipiation types OZ, RA, SN, SG, PL, IC, GR and GS may be combined, where appropriate. Only moderate or heavy precipitation to be indicated in trend forecasts. '3. Up to four cloud layers. 14. To be included subject to regonal air navigation agreement. 15. Number of change indicators to be kept to a minimum normally not exceeding three groups. Table A2-3. Use of change indicators in trend Forecasts APP 2-9 Change indicator l NOSlG I BECMG TEMPO Time indicator and period - FMnlnlnln, TLn2n2n2n2 TLnnnn FMnnnn ATnnnn - FMnlnlclnl TLn2n2n2n2 l TLnnnn FMnnnn - Meaning no significant changes are forecast the change is forecast to temporart fluctuations are forecast to commence at nln.nlnl UTC and be completed by n2n2n2n2 UTC commence at the beginning of the trend forecast period and be completed by nnnn UTC commence at nnnn UTC and be completed by the end of the trend forecast period cccur at nnnn UTC specified time a commence at the beginning of the trend forecast period and be completed by the end of the trend forecast period or b tne time s uncertain commence at nln.nlnl UTC and cease by n2n,n,n, UTC commence at the beginning of the trend forecast period and cease by nnnn UTC commence at nnnn UTC and cease by the end of the trend forecast period commence at the beginning of the trend forecast period and cease by the end i cf the trend forecast period
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