localizer


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localizer

[′lō·kə‚līz·ər]
(navigation)
A directional radio beacon to provide aircraft with signals for lateral guidance with respect to the runway centerline.

localizer

localizerclick for a larger image
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 image.
References in periodicals archive ?
Missed Approach Guidance -- The TLS will be able to deliver localizer guidance to an aircraft executing a missed approach.
Between crossing the FAF above glideslope and the turbulence, you've got your hands full trying to stay on the localizer and descending (but not too fast) to catch the glideslope.
I checked with some CFIs in the area who tell me ATC will approve an early turn to intercept the localizer for the asking.
Given the quartering headwind, I'd probably track the localizer outbound, but you could let yourself drift south holding a heading.
It's just a little arithmetic to use distance to identify the MAP on the localizer.
Why not just track the localizer outbound (which is what I would have instinctively done)?
The Base Bid of work shall consist of the installation of the following items: a new 4-way 4" ductbank system including Communication Manholes running parallel to Runway 16-34 from the Runway 16 IIS glide slope shelter connecting to the existing ductbank system a new 2-way 4" ductbank adjacent to the existing 6-way 4%* ductbank system installed for the "Relocate Airfield Lighting Project%1, RIAC Construction Contact #24865 to facilitate additional conduit and connections to the Airfield Lighting Vault and Air Traffic Control Tower installation of a lateral power and communication ductbank to a future weather station east of Runway 16-34 installation of a grounding grid/ring for the Runway 16ILS Shelter and the Runway 34 Localizer Shelter associated surface restoration of all ductbanks etc
The departure route description for 16L mentions a climbing right turn to heading 174 to intercept the localizer on the back course of 16R to Wagge intersection.
My instructor "remembered" the localizer frequency, but never identified it.