Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 960

k) expected significant changes to one or more of these elements during the period of validity. Optional elements shall be included in TAF in accordance with regional air navigation agreement. Note.— The visibility included in TAF refers to the forecast prevailing visibility. 6.2.4 Meteorological offices preparing TAF shall keep the forecasts under continuous review and, when necessary, shall issue amendments promptly. The length of the forecast messages and the number of changes indicated in the forecast shall be kept to a minimum. 6.2.5 TAF that cannot be kept under continuous review shall be cancelled. 6.2.6 Recommendation.— The period of validity of a routine TAF should be not less than 9 hours nor more than 24 hours; this period should be determined by regional air navigation agreement. Routine TAF valid for less than 12 hours should be issued every 3 hours and those valid for 12 to 24 hours should be issued every 6 hours. 6.3 Landing forecasts 6.3.1 A landing forecast shall be prepared by the meteorological office designated by the meteorological authority concerned; such forecasts are intended to meet requirements of local users and of aircraft within about one hour’s flying time from the aerodrome. 6.3.2 Landing forecasts shall be prepared in the form of a trend forecast, as determined by regional air navigation agreement. 2007/70/II. szám Annex 3 — Meteorological Service for International Air Navigation Chapter 6 25/11/04 6-2 6.3.3 A trend forecast shall consist of a concise statement of the expected significant changes in the meteorological conditions at that aerodrome to be appended to a local routine or local special report, or a METAR or SPECI. The period of validity of a trend forecast shall be 2 hours from the time of the report which forms part of the landing forecast. 6.4 Forecasts for take-off 6.4.1 A forecast for take-off shall be prepared by the meteorological office designated by the meteorological authority concerned. 6.4.2 Recommendation.— A forecast for take-off should refer to a specified period of time and should contain information on expected conditions over the runway complex in regard to surface wind direction and speed and any variations thereof, temperature, pressure (QNH), and any other elements as agreed locally. 6.4.3 Recommendation.— A forecast for take-off should be supplied to operators and flight crew members on request within the 3 hours before the expected time of departure. 6.4.4 Recommendation.— Meteorological offices preparing forecasts for take-off should keep the forecasts under continuous review and, when necessary, should issue amendments promptly. 6.5 Area and route forecasts, other than forecasts issued within the framework of the world area forecast system Note.— Provisions concerning forecasts issued within the framework of the world area forecast system are contained in Chapter 3 and Appendix 2 and those concerning area forecasts for low-level flights, under Section 6.6 and Appendix 5. 6.5.1 Area and route forecasts shall contain upper winds, upper-air temperatures, significant en-route weather phenomena and associated clouds. Other elements may be added as required. This information shall cover the flight operations for which they are intended in respect of time, altitude and geographical extent. 6.5.2 Meteorological offices preparing area and route forecasts shall keep the forecasts under continuous review and issue amendments as necessary. 6.6 Area forecasts for low-level flights 6.6.1 When the density of traffic operating below flight level 100 (or up to flight level 150 in mountainous areas, or higher, where necessary) warrants the routine issue and dissemination of area forecasts for such operations, the frequency of issue, the form and the fixed time or period of validity of those forecasts and the criteria of amendments thereto shall be determined by the meteorological authority in consultation with the users. 6.6.2 When the density of traffic operating below flight level 100 warrants the issuance of AIRMET information in accordance with 7.2.1, area forecasts for such operations shall be prepared in a format agreed upon between the meteorological authorities concerned. When abbreviated plain language is used, the forecast shall be prepared as a GAMET area forecast, employing approved ICAO abbreviations and numerical values. The area forecasts shall be issued to cover the layer between the ground and flight level 100 (or up to flight level 150 in mountainous areas, or higher, where necessary) and shall contain information on en-route weather phenomena hazardous to low-level flights, in support of the issuance of AIRMET information, and additional information required by low-level flights. 6.6.3 Area forecasts for low-level flights prepared in support of the issuance of AIRMET information shall be issued every 6 hours for a period of validity of 6 hours and transmitted to meteorological offices concerned not later than one hour prior to the beginning of their validity period. 2007/70/II. szám ANNEX 3 7-1 25/11/04 CHAPTER 7. SIGMET AND AIRMET INFORMATION, AERODROME WARNINGS AND WIND SHEAR WARNINGS Note.— Technical specifications and detailed criteria related to this chapter are given in Appendix 6. 7.1 SIGMET information 7.1.1 SIGMET information shall be issued by a meteorological watch office and shall give a concise description in abbreviated plain language concerning the occurrence and/or expected occurrence of specified en-route weather phenomena, which may affect the safety of aircraft operations, and of the development of those phenomena in time and space. 7.1.2 SIGMET information shall be cancelled when the phenomena are no longer occurring or are no longer expected to occur in the area. 7.1.3 The period of validity of a SIGMET message shall be not more than 6 hours, and preferably not more than 4 hours. 7.1.4 Recommendation.— In the special case of SIGMET messages for volcanic ash cloud and tropical cyclones, an outlook should be included giving information for up to 12 hours beyond the period of validity specified in 7.1.3, concerning the trajectory of the volcanic ash cloud and positions of the tropical cyclone centre. 7.1.5 Recommendation.— SIGMET messages issued in accordance with 7.1.4, concerning volcanic ash cloud and tropical cyclones should be based on advisory information provided by VAACs and TCACs respectively, designated by regional air navigation agreement. 7.1.6 Close coordination shall be maintained between the meteorological watch office and the associated area control centre/flight information centre to ensure that information on volcanic ash included in SIGMET and NOTAM messages is consistent. 7.1.7 A SIGMET message relating to the expected occurrence of weather phenomena listed in Appendix 6, 1.1.4, with the exception of volcanic ash cloud and tropical cyclones, shall be issued not more than 6 hours, and preferably not more than 4 hours, before the expected time of occurrence of that phenomenon. 7.1.8 Recommendation.— SIGMET messages concerning volcanic ash cloud or tropical cyclones expected to affect a flight information region should be issued up to 12 hours before the commencement of the period of validity or as soon as practicable if such advance warning of the existence of these phenomena is not available. SIGMET messages for volcanic ash and tropical cyclones should be updated at least every 6 hours. 7.2 AIRMET information 7.2.1 AIRMET information shall be issued by a meteorological watch office in accordance with regional air navigation agreement, taking into account the density of air traffic operating below flight level 100. AIRMET information shall give a concise description in abbreviated plain language concerning the occurrence and/or expected occurrence of specified en-route weather phenomena, which have not been included in Section I of the area forecast for low-level flights issued in accordance with Chapter 6, Section 6.6 and which may affect the safety of low-level flights, and of the development of those phenomena in time and space. 7.2.2 AIRMET information shall be cancelled when the phenomena are no longer occurring or are no longer expected to occur in the area. 7.2.3 The period of validity of an AIRMET message shall be not more than 6 hours, and preferably not more than 4 hours. 7.3 Aerodrome warnings 7.3.1 Aerodrome warnings shall be issued by the meteorological office designated by the meteorological authority concerned and shall give concise information of meteorological conditions which could adversely affect aircraft on the ground, including parked aircraft, and the aerodrome facilities and services. 7.3.2 Recommendation.— Aerodrome warnings should be cancelled when the conditions are no longer occurring and/ or no longer expected to occur at the aerodrome. 2007/70/II. szám Annex 3 — Meteorological Service for International Air Navigation Chapter 7 25/11/04 7-2 7.4 Wind shear warnings 7.4.1 Wind shear warnings shall be prepared by the meteorological office designated by the meteorological authority concerned and shall give concise information of the observed or expected existence of wind shear which could adversely affect aircraft on the approach path or take-off path or during circling approach between runway level and 500 m (1 600 ft) above that level and aircraft on the runway during the landing roll or take-off run. Where local topography has been shown to produce significant wind shears at heights in excess of 500 m (1 600 ft) above runway level, then 500 m (1 600 ft) shall not be considered restrictive. Note.— Guidance on the subject of wind shear is contained in the Manual on Wind Shear (Doc 9817, in preparation). 7.4.2 Recommendation.— Wind shear warnings for arriving aircraft and/or departing aircraft should be cancelled when aircraft reports indicate that wind shear no longer exists, or alternatively, after an agreed elapsed time. The criteria for the cancellation of a wind shear warning should be defined locally for each aerodrome, as agreed between the meteorological authority, the appropriate ATS authority and the operators concerned. 2007/70/II. szám ANNEX 3 8-1 25/11/04 CHAPTER 8. AERONAUTICAL CLIMATOLOGICAL INFORMATION Note.— Technical specifications and detailed criteria related to this chapter are given in Appendix 7. 8.1 General provisions Note.— In cases where it is impracticable to meet the requirements for aeronautical climatological information on a national basis, the collection, processing and storage of observational data may be effected through computer facilities available for international use, and the responsibility for the preparation of the required aeronautical climatological information may be delegated by agreement between the meteorological authorities concerned. 8.1.1 Aeronautical climatological information required for the planning of flight operations shall be prepared in the form of aerodrome climatological tables and aerodrome climatological summaries. Such information shall be supplied to aeronautical users as agreed between the meteorological authority and those users. Note.— Climatological data required for aerodrome planning purposes are set out in Annex 14, Volume I, 3.1.3 and in Attachment A. 8.1.2 Recommendation.— Aeronautical climatological information should normally be based on observations made over a period of at least five years and the period should be indicated in the information supplied. 8.1.3 Recommendation.— Climatological data related to sites for new aerodromes and to additional runways at existing aerodromes should be collected starting as early as possible before the commissioning of those aerodromes or runways. 8.2 Aerodrome climatological tables Recommendation.— Each Contracting State should make arrangements for collecting and retaining the necessary observational data and have the capability:

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