![]() ![]() (h) The emission from the localizer must be vertically polarized. The frequency tolerance may not exceed ☐.0001 percent. (g) The ISMLS localizer must operate in the band 5000 MHz to 5030 MHz. The applicable course sector angle will be established and approved on an individual basis. (f) The ISMLS course sector angle must be adjustable between 3 degrees and 9 degrees. (e) All horizontal angles employed in specifying the localizer field patterns must originate from the center of the localizer antenna system which provides the signals used in the front course sector. When an observer faces the localizer from the approach end of the runway, the depth of modulation of the radio frequency carrier due to the 150 Hz tone must predominate on his right hand and that due to the 90 Hz tone must predominate on his left hand. The radiation field pattern must produce a course sector with one tone predominating on one side of the course and with the other tone predominating on the opposite side. The localizer station must transmit angular guidance information over a C-band microwave carrier on narrow, scanned antenna beams that are encoded to produce a modulation in space which, after averaging over several beam scans, is equivalent to the modulation used for conventional ILS as specified in subpart C of this part. (d) The radiation from the localizer antenna system must produce a composite field pattern which is pulse duration modulated, the time average equivalent to amplitude modulation by a 90 Hz and 150 Hz tone. ![]() (c) At locations where two separate ISMLS facilities serve opposite ends of of a single runway, an interlock must ensure that only the facility serving the approach direction being used will radiate. If other than a runway centerline localizer is used, the criteria in subpart C of part 97 of this chapter is applicable. (b) On runways where limited terrain prevents the localizer antennae from being positioned on the runway centerline extended, and the cost of the land fill or a tall tower antenna support is prohibitive, the localizer antenna array may be offset, including a collocated ground station, so that the course intercepts the centerline at a point determined by the amount of the angular offset and the glide path angle. (6) Be installed on frangible mounts or beyond the 1000′ light bar. ![]() (5) Not obscure any light of the approach landing system and ![]() (4) Be located at a distance from the stop end of the runway that is consistent with safe obstruction clearance practices (3) Have the minimum height necessary to comply with the coverage requirements prescribed in paragraph (j) of this section (2) Be adjusted so that the course line be on a vertical plane containing the centerline of the runway served (1) Be located on the extension of the centerline of the runway at the stop end Now that you know how to spot a two-way left turn lane, let’s talk about how they must be used.This section prescribes the performance requirements for localizer equipment components of the ISMLS. Both outside lines are yellow, with the inner line broken and the outside line solid. The road markings used for a center left turn lane are distinctive and will not be seen elsewhere. Drivers who are approaching the intersection with the intention to drive straight through must merge out of this lane at the earliest opportunity. The start of the lane is usually always highlighted with a “CENTER LANE LEFT TURN ONLY” sign. Road signs and pavement markingsĬenter left turn lanes are easy to identify, as they are marked the same way everywhere. Below are the other rules you must consider when using the center turn lane. You may use the two-way left turn lane when turning left onto the roadway from an alley or driveway. ![]()
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