GM1 ADR-DSN.B.075 Distance between slope changes on runways

The following example illustrates how the distance between slope changes is to be determined (see Figure GM-B-2): D for a runway where the code number is 3 should be at least: 15 000 (│x – y│ + │y – z│) m │x – y│ being the absolute numerical value of x – y │y – z│ being the absolute numerical value of y – z Assuming x = +0.01 y = –0.005 z = +0.005 then │x – y│ = 0.015 then │y – z│ = 0.01 To comply with the specifications, D should be not less than: 15 000 (0.015 + 0.01) m, that is, 15 000 × 0.025 = 375 m When a runway is planned that should combine the extreme values for the slopes and changes in slope permitted, as prescribed in CS ADR-DSN.B.060 to CS ADR-DSN.B.080, a study should be made to ensure that the resulting surface profile should not hamper the operation of aeroplanes. [Figure or form omitted from this preview — available in the Avioverse workspace library.] Figure GM-B-2. Profile on centre line of runway