Localizer performance requirements.

CFR · 2024-01-01 · US · Title 14

This section prescribes the performance requirements for localizer equipment components of the ISMLS. (a) The localizer antenna system must: (1) Be located on the extension of the centerline of the runway at the stop end; (2) Be adjusted so that the course line be on a vertical plane containing the centerline of the runway served; (3) Have the minimum height necessary to comply with the coverage requirements prescribed in paragraph (j) of this section; (4) Be located at a distance from the stop end of the runway that is consistent with safe obstruction clearance practices; (5) Not obscure any light of the approach landing system; and (6) Be installed on frangible mounts or beyond the 1000′ light bar. (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. If other than a runway centerline localizer is used, the criteria in subpart C of part 97 of this chapter is applicable. (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. (d) The radiation from the localizer antenna system mu

official document · source cfr-2024 · id 14:§ 171.261