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- Runway_visual_range abstract "In aviation meteorology, runway visual range (RVR) is the distance over which a pilot of an aircraft on the centreline of the runway can see the runway surface markings delineating the runway or identifying its centre line. RVR is normally expressed in feet or meters. RVR is used as one of the main criteria for minima on instrument approaches, as in most cases a pilot must obtain visual reference of the runway to land an aircraft. The maximum RVR range is 2,000 metres or 6,000 feet, above which it is not significant and thus does not need to be reported. RVRs are provided in METARs and are transmitted by air traffic controllers to aircraft making approaches to allow pilots to assess whether it is prudent and legal to make an approach.RVR is also the main criterion used to determine the category of visual aids that are installed at an airport. The International Civil Aviation Organization ICAO stipulates in its Annex 14 that for RVR values above 550 m, CAT I lighting shall be installed, if RVR is between 300 m and 549 m then CAT II lighting is required. CAT IIIa is installed for RVR values between 175 m and 300 m. CAT IIIb is required for RVR values between 50 m and 175 m while there is no RVR limitation for CAT IIIc visual aids.Originally RVR was measured by a person, either by viewing the runway lights from the top of a vehicle parked on the runway threshold, or by viewing special angled runway lights from a tower at one side of the runway. The number of lights visible could then be converted to a distance to give the RVR. This is known as the human observer method and can still be used as a fall-back.Today most airports use Instrumented Runway Visual Range or IRVR, which is measured by devices called forward scatter meters which provide simplified installation as they are integrated units and can be installed as single unit(s) at a critical location along the runway or transmissometers which are installed at one side of a runway relatively close to its edge. Normally three transmissometers are provided, one at each end of the runway and one at the midpoint. In the US, Forward Scatter RVRs are replacing transmissometers at most airports. According to the US Federal Aviation Administration: "There are approximately 279 RVR systems in the NAS, of which 242 are forward scatter NG RVR Systems and 34 are older Transmissometer Systems."".
- Runway_visual_range thumbnail Transmissometer.jpg?width=300.
- Runway_visual_range wikiPageExternalLink iwv.
- Runway_visual_range wikiPageExternalLink rvr-status.pl.
- Runway_visual_range wikiPageExternalLink rvr.
- Runway_visual_range wikiPageID "2039341".
- Runway_visual_range wikiPageLength "3627".
- Runway_visual_range wikiPageOutDegree "13".
- Runway_visual_range wikiPageRevisionID "666245864".
- Runway_visual_range wikiPageWikiLink Air_traffic_controller.
- Runway_visual_range wikiPageWikiLink Aviation.
- Runway_visual_range wikiPageWikiLink Category:Air_traffic_control.
- Runway_visual_range wikiPageWikiLink Category:Aviation_meteorology.
- Runway_visual_range wikiPageWikiLink Foot_(unit).
- Runway_visual_range wikiPageWikiLink Instrument_approach.
- Runway_visual_range wikiPageWikiLink International_Civil_Aviation_Organization.
- Runway_visual_range wikiPageWikiLink METAR.
- Runway_visual_range wikiPageWikiLink Meteorology.
- Runway_visual_range wikiPageWikiLink Meters.
- Runway_visual_range wikiPageWikiLink Metre.
- Runway_visual_range wikiPageWikiLink Transmissometer.
- Runway_visual_range wikiPageWikiLink File:RVR_fallacy.png.
- Runway_visual_range wikiPageWikiLink File:Transmissometer.jpg.
- Runway_visual_range wikiPageWikiLinkText "IRVR".
- Runway_visual_range wikiPageWikiLinkText "RVR".
- Runway_visual_range wikiPageWikiLinkText "Runway Visual Range (RVR)".
- Runway_visual_range wikiPageWikiLinkText "Runway Visual Range".
- Runway_visual_range wikiPageWikiLinkText "Runway visibility".
- Runway_visual_range wikiPageWikiLinkText "Runway visual range".
- Runway_visual_range wikiPageWikiLinkText "published minimum".
- Runway_visual_range wikiPageWikiLinkText "runway visibility".
- Runway_visual_range wikiPageWikiLinkText "runway visual range".
- Runway_visual_range hasPhotoCollection Runway_visual_range.
- Runway_visual_range subject Category:Air_traffic_control.
- Runway_visual_range subject Category:Aviation_meteorology.
- Runway_visual_range hypernym Distance.
- Runway_visual_range type Agent.
- Runway_visual_range comment "In aviation meteorology, runway visual range (RVR) is the distance over which a pilot of an aircraft on the centreline of the runway can see the runway surface markings delineating the runway or identifying its centre line. RVR is normally expressed in feet or meters. RVR is used as one of the main criteria for minima on instrument approaches, as in most cases a pilot must obtain visual reference of the runway to land an aircraft.".
- Runway_visual_range label "Runway visual range".
- Runway_visual_range sameAs مدى_رؤية_المدرج.
- Runway_visual_range sameAs Dráhová_dohlednost.
- Runway_visual_range sameAs Banesynsvidde.
- Runway_visual_range sameAs Runway_Visual_Range.
- Runway_visual_range sameAs 滑走路視距離.
- Runway_visual_range sameAs Runway_visual_range.
- Runway_visual_range sameAs m.06gy1k.
- Runway_visual_range sameAs Q2030744.
- Runway_visual_range sameAs Q2030744.
- Runway_visual_range sameAs 跑道視程.
- Runway_visual_range wasDerivedFrom Runway_visual_range?oldid=666245864.
- Runway_visual_range depiction Transmissometer.jpg.
- Runway_visual_range isPrimaryTopicOf Runway_visual_range.