---
title: "CS ADR-DSN.Q.847 Lighting of fixed objects with a height less than 45 m above ground level — Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes · Avioverse"
description: "Low-intensity obstacle lights, Type A or B, should be used where the object is a less extensive one and its height above the surrounding ground is less…"
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-q-visual-aids-for-denoting-obstacles/cs-adr-dsn-q-847"
---

# CS ADR-DSN.Q.847 Lighting of fixed objects with a height less than 45 m above ground level

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.Q.847 Lighting of fixed objects with a height less than 45 m above ground level

(a) Low-intensity [obstacle](https://avioverse.aero/glossary/easa/obstacle) lights, Type A or B, should be used where the object is a less extensive one and its height above the surrounding ground is less than 45 m.

(b) Where the use of low-intensity obstacle lights, Type A or B, would be inadequate, or an early special warning is required, then medium- or high-intensity obstacle lights should be used.

(c) Low-intensity obstacle lights, Type B, should be used either alone or in combination with medium-intensity obstacle lights, Type B, in accordance with subparagraph (d), below.

(d) Medium-intensity obstacle lights, Type A, B, or C, should be used where the object is an extensive one. Medium-intensity obstacle lights, Types A and C, should be used alone, whereas medium-intensity obstacle lights, Type B, should be used either alone or in combination with low-intensity obstacle lights, Type B.

\[Issue: ADR-DSN/3]

IR · CS ADR-DSN.Q.847 — 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.