---
title: "CS 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: "Applicability: The specifications in paragraph (b) below apply only to the area under control of the aerodrome operator."
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-j-obstacle-limitation-requirements/cs-adr-dsn-j-487"
---

# CS 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

IR Implementing rule

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

(a) Applicability: The specifications in paragraph (b) below apply only to the area under control of the [aerodrome operator](https://avioverse.aero/glossary/easa/aerodrome-operator).

(b) In areas beyond the limits of the [obstacle](https://avioverse.aero/glossary/easa/obstacle) limitation surfaces, at least those objects which extend to a height of 150 m or more above ground elevation should be regarded as obstacles, unless a safety assessment indicates that they do not constitute a hazard to aeroplanes.

\[Issue: ADR-DSN/3]

IR · CS 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.