---
title: "GM1 ADR-DSN.B.075 Distance between slope changes on runways — Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes · Avioverse"
description: "The following example illustrates how the distance between slope changes is to be determined (see Figure GM-B-2):"
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-b-runways/gm1-adr-dsn-b-075"
---

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

Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7 · Regulation (EU) No 139/2014 · EAR revision 13 Mar 2026

GM Guidance material

## 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](https://avioverse.aero/glossary/easa/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

GM · GM1 ADR-DSN.B.075 — Regulation (EU) No 139/2014 · ED Decision 2014/013/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in CHAPTER B — RUNWAYS](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-b-runways)

Consolidated from the EASA Easy Access Rules (revision 13 Mar 2026, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.