Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 246

(2002). Secretariat Restructuring of Annex 3 into two parts; new and amended definitions; upgrading of certain Recommended Practices to Standards; elimination of the need to issue WAFS products in T4 chart form; introduction of the requirement to maintain the integrity of WAFS forecasts; notification of volcanic activity to ACC, MWO and VAAC by selected State volcano observatories; introduction of provisions allowing the issuance of SIGMET messages for volcanic ash and tropical cyclones in graphical format using the WMO BUFR code form; introduction of templates for special air-report (downlink), volcanic ash and tropical cyclone advisory messages and aerodrome and wind shear warnings; introduction of a requirement to issue METARs and SPECIs prior to the aerodrome resuming operations; introduction of enabling provisions to use fully automatic observing systems during non-operational hours; introduction of prevailing visibility; introduction of a requirement to cancel aerodrome forecasts that cannot be kept under continuous review; introduction of a provision for the averaging period for measuring visibility and variation in the mean wind speed; introduction of a provision to use maximum light intensity for assessment of RVR for METAR and SPECI; the deletion of Model TB Example 2; inclusion of new Examples 3 and 4 under Model SWH, deletion of Attachment A; introduction of a new Attachment C describing back-up procedures at WAFCs; and editorial amendments. 25 February 2004 12 July 2004 25 November 2004 Annex 3 — Meteorological Service for International Air Navigation Foreword 7/11/07 (xviii) Amendment(s) Source(s) Subject(s) Adopted/approved Effective Applicable (16th Edition) World Area Forecast System Operations Group (WAFSOPSG). International Airways Volcano Watch Operations Group (IAVWOPSG). International Air Transport Association (IATA). ICAO Secretariat Amendments to the definitions of “cloud of operational significance” and “prevailing visibility” and the deletion of the definition for “service area (world area forecast system)”; deletion of all requirements by SST; introduction of a requirement for volcanic ash advisory centre (VAAC) back-up procedures; elimination of the need to amend significant weather (SIGWX) forecasts; introduction of forecasts of altitude of the standard WAFS flight levels; elimination of the requirement to issue aerodrome special meteorological reports (SPECI) when half-hourly aerodrome routine meteorological reports (METAR) are issued; amendment to the reporting of gusts in local routine and special reports when noise abatement procedures are being applied; alignment of the criteria for the use of change groups in a TAF with those for the issuance of SPECI; introduction of enabling clauses to use the binary universal form for the representation of meteorological data (BUFR) code form for the dissemination of METAR/SPECI and TAF on a bilateral basis; introduction of secondary surveillance radar (SSR) Mode S data link in automatic meteorological reporting; elimination of outlook from SIGMET related to volcanic ash and tropical cyclones; introduction of the requirement to provide standard WAFS charts for fixed areas of coverage; introduction of the provision preventing modifications to the meteorological content of WAFS forecasts; upgrading of provisions in order to foster the use of WAFS forecasts; elimination of surface fronts, convergence zones and clouds other than CB from the high- and medium-level SIGWX forecasts; advancement of the lead time of issuance of SIGWX forecasts; harmonization of the volcanic ash advisory format with the tropical cyclone advisory format; introduction of a criterion related to the issuance of tropical cyclone advisories; amendments to the tropical cyclone advisory to introduce 6-hour forecasts; change to the definition of “vicinity”; expansion of the use of automatic systems to include operational hours; amendments to the automatic reporting of turbulence; introduction of a new template for GAMET messages; extension of the validity period of TAF to meet requirements for very long-haul flights; introduction of provisions for graphical SIGMET for all phenomena; update of the SIGMET template to include radioactive cloud; introduction of “tsunami” in aerodrome warnings; alignment of Annexes 3 and 11 provisions concerning meteorological information to be supplied to air traffic services (ATS); amendment of the criteria to include SIGMET and TAF in VOLMET and D-VOLMET; deletion of the attainable accuracy of observation and measurement from Attachment A; update of the desirable accuracy in Attachment B; and editorial amendments. 21 February 2007 16 July 2007 17 November 2007; 15 November 2008 ___________________ INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES PART I CORE SARPs ANNEX 3 1-1 7/11/07 CHAPTER 1. DEFINITIONS Note.— The designation (RR) in these definitions indicates a definition which has been extracted from the Radio Regulations of the International Telecommunication Union (ITU) (see Handbook on Radio Frequency Spectrum Requirements for Civil Aviation including Statement of Approved ICAO Policies (Doc 9718)). 1.1 Definitions When the following terms are used in the Standards and Recommended Practices for Meteorological Service for International Air Navigation, they have the following meanings: Aerodrome. A defined area on land or water (including any buildings, installations and equipment) intended to be used either wholly or in part for the arrival, departure and surface movement of aircraft. Aerodrome climatological summary. Concise summary of specified meteorological elements at an aerodrome, based on statistical data. Aerodrome climatological table. Table providing statistical data on the observed occurrence of one or more meteorological elements at an aerodrome. Aerodrome control tower. A unit established to provide air traffic control service to aerodrome traffic. Aerodrome elevation. The elevation of the highest point of the landing area. Aerodrome meteorological office. An office, located at an aerodrome, designated to provide meteorological service for international air navigation. Aerodrome reference point. The designated geographical location of an aerodrome. Aeronautical fixed service (AFS). A telecommunication service between specified fixed points provided primarily for the safety of air navigation and for the regular, efficient and economical operation of air services. Aeronautical fixed telecommunication network (AFTN). A worldwide system of aeronautical fixed circuits provided, as part of the aeronautical fixed service, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics. Aeronautical meteorological station. A station designated to make observations and meteorological reports for use in international air navigation. Aeronautical mobile service (RR S1.32). A mobile service between aeronautical stations and aircraft stations, or between aircraft stations, in which survival craft stations may participate; emergency position-indicating radio beacon stations may also participate in this service on designated distress and emergency frequencies. Aeronautical telecommunication station. A station in the aeronautical telecommunication service. Aircraft. Any machine that can derive support in the atmosphere from the reactions of the air other than the reactions of the air against the earth’s surface. Annex 3 — Meteorological Service for International Air Navigation Chapter 1 7/11/07 1-2 Aircraft observation. The evaluation of one or more meteorological elements made from an aircraft in flight. AIRMET information. Information issued by a meteorological watch office concerning the occurrence or expected occurrence of specified en-route weather phenomena which may affect the safety of low-level aircraft operations and which was not already included in the forecast issued for low-level flights in the flight information region concerned or sub-area thereof. Air-report. A report from an aircraft in flight prepared in conformity with requirements for position, and operational and/or meteorological reporting. Note.— Details of the AIREP form are given in the PANS-ATM (Doc 4444). Air traffic services unit. A generic term meaning variously, air traffic control unit, flight information centre or air traffic services reporting office. Alternate aerodrome. An aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or to land at the aerodrome of intended landing. Alternate aerodromes include the following: Take-off alternate. An alternate aerodrome at which an aircraft can land should this become necessary shortly after takeoff and it is not possible to use the aerodrome of departure. En-route alternate. An aerodrome at which an aircraft would be able to land after experiencing an abnormal or emergency condition while en route. ETOPS en-route alternate. A suitable and appropriate alternate aerodrome at which an aeroplane would be able to land after experiencing an engine shut-down or other abnormal or emergency condition while en route in an ETOPS operation. Destination alternate. An alternate aerodrome to which an aircraft may proceed should it become either impossible or inadvisable to land at the aerodrome of intended landing. Note.— The aerodrome from which a flight departs may also be an en-route or a destination alternate aerodrome for that flight. Altitude. The vertical distance of a level, a point or an object considered as a point, measured from mean sea level (MSL). Approach control unit. A unit established to provide air traffic control service to controlled flights arriving at, or departing from, one or more aerodromes. Appropriate ATS authority. The relevant authority designated by the State responsible for providing air traffic services in the airspace concerned. Area control centre. A unit established to provide air traffic control service to controlled flights in control areas under its jurisdiction. Automatic dependent surveillance (ADS). A surveillance technique in which aircraft automatically provide, via a data link, data derived from on-board navigation and position-fixing systems, including aircraft identification, four-dimensional position and additional data as appropriate. Briefing. Oral commentary on existing and/or expected meteorological conditions. Cloud of operational significance. A cloud with the height of cloud base below 1 500 m (5 000 ft) or below the highest minimum sector altitude, whichever is greater, or a cumulonimbus cloud or a towering cumulus cloud at any height. Chapter 1 Annex 3 — Meteorological Service for International Air Navigation 1-3 7/11/07 Consultation. Discussion with a meteorologist or another qualified person of existing and/or expected meteorological conditions relating to flight operations; a discussion includes answers to questions. Control area. A controlled airspace extending upwards from a specified limit above the earth. Cruising level. A level maintained during a significant portion of a flight. Elevation. The vertical distance of a point or a level, on or affixed to the surface of the earth, measured from mean sea level. Extended range operation. Any flight by an aeroplane with two turbine power-units where the flight time at the one powerunit inoperative cruise speed (in ISA and still air conditions), from a point on the route to an adequate alternate aerodrome, is greater than the threshold time approved by the State of the Operator. Flight crew member. A licensed crew member charged with duties essential to the operation of an aircraft during a flight duty period. Flight documentation. Written or printed documents, including charts or forms, containing meteorological information for a flight. Flight information centre. A unit established to provide flight information service and alerting service. Flight information region. An airspace of defined dimensions within which flight information service and alerting service are provided. Flight level. A surface of constant atmospheric pressure which is related to a specific pressure datum, 1 013.2 hectopascals (hPa), and is separated from other such surfaces by specific pressure intervals. Note 1.— A pressure type altimeter calibrated in accordance with the Standard Atmosphere:

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