1. Geometric characteristics of movement areas

1.1 Longitudinal profile of runway centerline

• The longitudinal profile of a runway must be as flat and horizontal as possible; the average slopes (calculated by dividing the difference in altitude between the highest and lowest points of the runway by its length) are therefore much lower than the usual values for roads (less than 2%; cf. table 1 of art. ). Longitudinal profile specifications are also required at all points.

  In addition, to enable Category II and III precision approaches to be carried out, no part of the first 900...