#Aircraft localizer pdf#
Google Patents Two frequency localizer guidance systemĭownload PDF Info Publication number US3866228A US3866228A US344358A US34435873A US3866228A US 3866228 A US3866228 A US 3866228A US 344358 A US344358 A US 344358A US 34435873 A US34435873 A US 34435873A US 3866228 A US3866228 A US 3866228A Authority US United States Prior art keywords frequency power course localizer clearance Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3866228A - Two frequency localizer guidance system The middle locator at DAL is identified by the last two letters.US3866228A - Two frequency localizer guidance system The coding identification of the outer locator consists of the first two letters of the three-letter identifier of the associated LOC.
![aircraft localizer aircraft localizer](https://i.stack.imgur.com/45h6Z.jpg)
Specified in the procedure, may be substituted for the OM.Ĭompass locators are low-powered NDBs sometimes collocated with outer and/or inner marker beacons. Precision radar, or compass locators located at the Outer Marker (OM) or Middle Marker (MM), may be substituted for marker beacons.
#Aircraft localizer code#
The inner marker is annunciated by a flashing white light on the panel and a rapid series of short high-pitched tones (like Morse Code "dits"). It indicates the point at which an aircraft is at the decision height on the glidepath during a Category II ILS approach. The inner marker, where installed, is located on the front course between the MM and the landing threshold.
![aircraft localizer aircraft localizer](http://3.bp.blogspot.com/-XwMfjJ2e48I/TjNaOTv4hSI/AAAAAAAAAAg/ZALp58C2_Y4/w1200-h630-p-k-no-nu/ilspic.png)
An aircraft on the glide slope over the middle marker should be roughly 200 feet above the touchdown zone elevation.Ĭategory II ILS approach systems may include a third marker beacon called the inner marker (IM), although these are becoming less common. When the aircraft crosses the middle marker, a flashing amber light will annunciate. When the aircraft crosses the outer marker a flashing blue light will annunciate on the panel. The middle marker (MM) is usually located 3,500 feet from the runway threshold. The outer marker (OM) is usually located 4-7 NM from the runway threshold. ILS courses may include two VHF marker beacon transmitters along the final approach course centerline. The system consists of a pair of synchronized flashing lights placed laterally on each side of the runway threshold facing the approach area. Runway end identifier lights (REIL) are installed for rapid and positive identification of the approach end of an instrument runway.
![aircraft localizer aircraft localizer](https://exelcomposites.com/wp-content/uploads/2020/02/exel_localizer_antenna_support_Menorca_airport.jpg)
If the minimum published visibility for an ILS runway equipped with MALSR, is no lower than 3/4 SM, the pilot should be aware that there may be a penetration of the obstacle identification surfaces (OIS) and care should be taken in the visual segment to avoid any obstacles. The MALSR, consisting of a combination of threshold lamps, steady burning light bars and flashers, provides visual information to pilots on runway alignment, height perception, roll guidance, and horizontal references for Category I Precision Approaches. The MALSR (Medium Intensity Approach Lighting System With Runway Alignment Indicator Lights) is a medium approach intensity lighting system (ALS) installed in airport runway approach zones along the extended centerline of the runway.