Page 152 - Planning and Design of Airports
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Outer marker beacon
                                       Purple light
                                Localizer modulation
                                 frequency
                             Middle marker beacon
                          Amber light
                                                Glide slope  modulation  frequency  0.7°  0.7°  3.0°–6.0°  3° above  horizontal (optimum)
                     Point of  intersection,  runway and glide  path extended  200 ft (60 m)  4–7 mi (6–11 km)

               Localizer array  Glide-slope array                       guration.




                                    3000–4000 ft  (900–1200 m)         ILS system confi








                                                                       FIGURE 3-16






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