localizer

An element in the instrument landing system (ILS) located approximately 1000 ft (300 m) beyond the upwind end of the runway and generally in line with the centerline. It indicates the extended centerline of the runway and the approach path onto the runway and directs the pilot to make his or her final approach along this path for landing. It operates in the frequency band of 108 to 111.95 MHz. A localizer transmits two signals, one modulated with a 90-hertz tone and the other with a 150-hertz tone. The two signals are transmitted from highly directional antennae in such a way that the two signals overlap with equal strength on the runway extended centerline. If the aircraft is not on the centerline, the ILS vertical needle swings to indicate lateral displacement. When the pilot is flying along the centerline, the needle stays in the center; the pilot makes an effort to maintain this throughout the approach. Identification is transmitted on the localizer frequency, using International Morse Code; it consists of a three-letter identifier preceded by the letter I (. . ). The localizer coverage is indicated in the illustration. On aeronautical charts, the availability of this facility is indicated by the symbol .

Aviation dictionary. 2014.

Look at other dictionaries:

  • localizer — [lō′kəl īz΄ər] n. a directional radio beam sent from the beginning of the runway and used to align an incoming airplane * * * …   Universalium

  • localizer — [lō′kəl īz΄ər] n. a directional radio beam sent from the beginning of the runway and used to align an incoming airplane …   English World dictionary

  • Localizer — Abbildung der Sendekeulen von Localizer und Glideslopes Das Instrumentenlandesystem (engl. instrument landing system, ILS) ist ein bodenbasiertes System, das den Piloten eines Flugzeuges bei Anflug und Landung mittels zweier Leitstrahlen,… …   Deutsch Wikipedia

  • Localizer — A localizer is one component of an Instrument Landing System (ILS). The localizer provides runway centerline guidance to aircraft. In some cases a localizer is at an angle to the runway usually due to obstructions around the airport. It is then… …   Wikipedia

  • localizer — kurso radijo švyturys statusas T sritis radioelektronika atitikmenys: angl. course radiobeacon; localizer vok. Landekurssender, m rus. курсовой маяк, m; курсовой радиомаяк, m pranc. radiobalise de guidage d atterrissage, f …   Radioelektronikos terminų žodynas

  • localizer — kurso radijo švyturys statusas T sritis Gynyba apibrėžtis Kryptinis radijo švyturys, leidžiantis nustatyti orlaivio šoninį nuokrypį iš anksto nustatytos galutinio artėjimo tūpti krypties atžvilgiu. atitikmenys: angl. localizer pranc. radiophare… …   NATO terminų aiškinamasis žodynas

  • localizer — A directional radio beacon which provides to an aircraft an indication of its lateral position relative to a predetermined final approach course. See also instrument landing system …   Military dictionary

  • localizer — noun A person who localizes See Also: localization, localizor, localize, locale, locality, localism …   Wiktionary

  • localizer — lo·cal·iz·er (loґkəl īz″ər) 1. an instrument for locating solid particles in the eyeball by radiography. 2. a visual training instrument for establishing correct spatial localization in treating amblyopia ex anopsia …   Medical dictionary

  • localizer — n. something which makes local; something which limits to a specific area; something which concentrates in a specific location; (Medicine) apparatus used to locate solid particles in the eyeball by radiography …   English contemporary dictionary

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