---
title: "CS ADR-DSN.T.920 Fencing — Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes · Avioverse"
description: "The safety objective of fencing is to prevent animals or unauthorised persons that could be a safety risk to aircraft operations, to enter the aerodrome."
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-t-aerodrome-operational-services-equipment/cs-adr-dsn-t-920"
---

# CS ADR-DSN.T.920 Fencing

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.T.920 Fencing

(a) The safety objective of fencing is to prevent animals or unauthorised persons that could be a safety risk to [aircraft](https://avioverse.aero/glossary/easa/aircraft) operations, to enter the [aerodrome](https://avioverse.aero/glossary/easa/aerodrome).

(b) Fencing should be sited as far away from the [runway](https://avioverse.aero/glossary/easa/runway) and [taxiway](https://avioverse.aero/glossary/easa/taxiway) centre lines as practicable.

(c) Suitable means of protection such as fence or other suitable barrier should be provided on an aerodrome to prevent the entrance to the aerodrome:

(1) by non-flying animals large enough to be a hazard to aircraft; and/or

(2) by an unauthorised person.

This includes the barring of sewers, ducts, tunnels, etc. where necessary to prevent access.

(d) Suitable means of protection should be provided to deter the inadvertent or premeditated access of unauthorised persons into ground installations and facilities essential for the safety of civil aviation located off the aerodrome.

IR · CS ADR-DSN.T.920 — Regulation (EU) No 139/2014 · ED Decision 2014/013/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in CHAPTER T — AERODROME OPERATIONAL SERVICES, EQUIPMENT AND INSTALLATION](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-t-aerodrome-operational-services-equipment)

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.