---
title: "GM1 ADR-DSN.J.487 Objects outside the obstacle limitation surfaces — Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes · Avioverse"
description: "Beyond the limits of the obstacle limitation surfaces the safety assessment should be conducted for the proposed constructions that extend above the…"
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/gm1-adr-dsn-j-487"
---

# GM1 ADR-DSN.J.487 Objects outside 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.J.487 Objects outside the obstacle limitation surfaces

(a) Beyond the limits of the [obstacle](https://avioverse.aero/glossary/easa/obstacle) limitation surfaces the safety assessment should be conducted for the proposed constructions that extend above the established limits in order to protect safe operation of [aircraft](https://avioverse.aero/glossary/easa/aircraft).

(b) The safety assessment may have regard to the nature of operations concerned and may distinguish between day and night operations.

\[Issue: ADR-DSN/3]

GM · GM1 ADR-DSN.J.487 — Regulation (EU) No 139/2014 · ED Decision 2016/027/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in CHAPTER J — OBSTACLE LIMITATION REQUIREMENTS](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements)

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.