---
title: "GM1 ADR-DSN.Q.845 Marking of fixed objects — Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes · Avioverse"
description: "Orange and white or alternatively red and white are preferably used, except where such colours merge with the background."
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-q-visual-aids-for-denoting-obstacles/gm1-adr-dsn-q-845"
---

# GM1 ADR-DSN.Q.845 Marking of fixed objects

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.Q.845 Marking of fixed objects

(a) Orange and white or alternatively red and white are preferably used, except where such colours merge with the background.

(b) Table Q-4 shows a formula for determining band widths, and for having an odd number of bands, thus permitting both the top and bottom bands to be of the darker colour.

(c) Against some backgrounds it may be found necessary to use a different colour from orange or red to obtain sufficient contrast.

(d) Alternative spacing may be suitable; priority is to highlight the location and definition of the object.

\[Issue: ADR-DSN/3]

GM · GM1 ADR-DSN.Q.845 — Regulation (EU) No 139/2014 · ED Decision 2016/027/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in CHAPTER Q — VISUAL AIDS FOR DENOTING OBSTACLES](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-q-visual-aids-for-denoting-obstacles)

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.