2)ILS point "B" is the point on the glide path at Which the projection shall coincide with the point located on the extended runway centerline in the approach direction at a distance of 1.05 kilometers, hereinafter, the same shall apply.
3)ILS point "C" is the point of intersection of the glide path and the horizontal plane 30 meters above the vertical of the approach end of the runway threshold.
4)ILS reference datum point is the point on the glide path and the projection shall coincide with the center point of the approach end of the runway threshold.
5)ILS point "D" is the point located vertically 4 meters above a point on the runway center line at a distance of 900 meters from the approach end of the runway threshold to the runway end.
6)ILS point "E" is the point located vertically 4 meters above a point on the runway center line with a distance of 600 meters from the approach end of the runway threshold to the runway end.
(ｪ･)The distance from the projection of the course line to the center of the approach end of the runway threshold shall be 10.5 meters or the distance from the course line to the point at which DDM shall be 0.015, whichever is less, for a localizer of the Facility Performance Category I-ILS, and shall not exceed 7.5 meters for a localizer of the Facility Performance Category II-ILS and 3.0 meters for a localizer of the Facility Performance Category III-U.S.
(ｪ･｡)The DDM in the horizontal plane of the course line or the ratio of the variation shall be as follows:
I. The displacement sensitivity (the ratio of DDM displacement to the distance displacement) shall be 0.00 145 per meter at the intersection of the half-course sector with the vertical plane of the approach end of the runway threshold and the deviation shall not exceed 17 percent for a localizer of the Facility Performance Category I-ILS, the Category II-ILS and 10 percent for a localizer of the Facility Performance Category III-ILS
II. The DDM shall increase, at a rate as close as possible to a constant rate, in proportion to the increase of the horizontal angle (the angle, in the horizontal plane of the course line, formed by the intersection of the line from the point to the centre of the localizer antenna system with the course line; the same shall apply hereinafter) of the course line, up to the horizontal angle where the DDM is 0.180.
III. The DDM shall be not less than 0.180 from the horizontal angle where the horizontal angle is 10 degrees.
?. The DDM shall be not less than 0.155 in the sector where the horizontal angle is from 10 degrees to 35 degrees.
(ｪ･｢)The course sector angle shall be less than 6 degrees.
(ｪ･｣)The radio frequency of the identification signal shall be 1,020 Hz
