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- Localizer_type_directional_aid abstract "A localizer type directional aid (LDA) is a type of localizer-based instrument approach to an airport. It is used in places where, due to terrain and other factors, the localizer antenna array is not aligned with the runway it serves. In these cases, the localizer antenna array may be offset (i.e. pointed or aimed) in such a way that the approach course it projects no longer lies along the extended runway centerline (which is the norm for non-offset and non-LDA localizer systems). If the angle of offset is three degrees or less, the facility is classified as an offset localizer. If the offset angle is greater than three degrees, the facility is classified as a localizer-type directional aid (LDA). As a "directional aid," and only a Category I (CAT I) approach, rather than a full-fledged instrument landing system (ILS), the LDA is more commonly used to help the pilot safely reach a point near the runway environs, where he or she hopefully can see the runway, at which point he or she will proceed and land visually, as opposed to (for example) full Category III (CAT III) ILS systems that allow a pilot to fly, without visual references, right down to the runway surface or very close to it depending on the exact equipment in the aircraft and on the ground. An LDA uses exactly the same equipment to create the course as a standard localizer used in ILS. An LDA approach also is designed with a normal course width, which is typically 3 to 6 degrees. (At each "edge-of-course," commonly 1.5 or 3 degrees left and right of course, the transmitted signal is created in such a way as to ensure full-scale CDI needle deflection at and beyond these edges, so the pilot will never falsely believe that he is intercepting the course outside of the actual course area. The area between these full-scale needle deflections is what defines the course width.) An LDA approach (considered a non-precision approach) may have one or more marker beacons, perhaps a DME, and in rare instances a glide slope, just as other precision approaches have, such as ILS approaches.If the offset is not greater than 30 degrees, straight-in approach minima may be published; circling minima only are published when offset exceeds 30 degrees.".
- Localizer_type_directional_aid wikiPageExternalLink aim.
- Localizer_type_directional_aid wikiPageID "10571012".
- Localizer_type_directional_aid wikiPageRevisionID "581872872".
- Localizer_type_directional_aid hasPhotoCollection Localizer_type_directional_aid.
- Localizer_type_directional_aid subject Category:Aircraft_instruments.
- Localizer_type_directional_aid subject Category:Radio_navigation.
- Localizer_type_directional_aid type AircraftInstruments.
- Localizer_type_directional_aid type Artifact100021939.
- Localizer_type_directional_aid type Device103183080.
- Localizer_type_directional_aid type Instrument103574816.
- Localizer_type_directional_aid type Instrumentality103575240.
- Localizer_type_directional_aid type Object100002684.
- Localizer_type_directional_aid type PhysicalEntity100001930.
- Localizer_type_directional_aid type Whole100003553.
- Localizer_type_directional_aid comment "A localizer type directional aid (LDA) is a type of localizer-based instrument approach to an airport. It is used in places where, due to terrain and other factors, the localizer antenna array is not aligned with the runway it serves. In these cases, the localizer antenna array may be offset (i.e. pointed or aimed) in such a way that the approach course it projects no longer lies along the extended runway centerline (which is the norm for non-offset and non-LDA localizer systems).".
- Localizer_type_directional_aid label "Localizer type directional aid".
- Localizer_type_directional_aid sameAs m.02qj1x_.
- Localizer_type_directional_aid sameAs Q6664652.
- Localizer_type_directional_aid sameAs Q6664652.
- Localizer_type_directional_aid sameAs Localizer_type_directional_aid.
- Localizer_type_directional_aid wasDerivedFrom Localizer_type_directional_aid?oldid=581872872.
- Localizer_type_directional_aid isPrimaryTopicOf Localizer_type_directional_aid.