---
title: "GM1 ADR-DSN.Q.841 Objects to be marked and/or lighted outside the lateral boundaries of the obstacle limitation surfaces — Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes · Avioverse"
description: "Other objects outside the obstacle limitation surfaces should be marked and/or lighted if a safety assessment indicates that the object could constitute…"
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-q-visual-aids-for-denoting-obstacles/gm1-adr-dsn-q-841"
---

# GM1 ADR-DSN.Q.841 Objects to be marked and/or lighted outside the lateral boundaries of the obstacle limitation surfaces

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.841 Objects to be marked and/or lighted outside the lateral boundaries of the obstacle limitation surfaces

(a) Other objects outside the [obstacle](https://avioverse.aero/glossary/easa/obstacle) limitation surfaces should be marked and/or lighted if a safety assessment indicates that the object could constitute a hazard to [aircraft](https://avioverse.aero/glossary/easa/aircraft) (this includes objects adjacent to visual routes e.g. waterway, highway).

(b) Overhead wires, cables, etc., crossing a river, waterway, valley or highway should be marked and their supporting towers marked and lighted if a safety assessment indicates that the wires or cables could constitute a hazard to aircraft.

\[Issue: ADR-DSN/3]

GM · GM1 ADR-DSN.Q.841 — 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.