---
title: "CS ADR-DSN.T.921 Autonomous runway incursion warning system (ARIWS) — Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes · Avioverse"
description: "Applicability: The inclusion of detailed specifications for an ARIWS is not intended to imply that an ARIWS has to be provided at an aerodrome."
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-t-aerodrome-operational-services-equipment/cs-adr-dsn-t-921"
---

# CS ADR-DSN.T.921 Autonomous runway incursion warning system (ARIWS)

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.921 Autonomous runway incursion warning system (ARIWS)

(a) Applicability: The inclusion of detailed specifications for an ARIWS is not intended to imply that an ARIWS has to be provided at an [aerodrome](https://avioverse.aero/glossary/easa/aerodrome).

(b) Characteristics: Where an ARIWS is installed at an aerodrome:

(1) It should provide autonomous detection of a potential incursion or of the occupancy of an active [runway](https://avioverse.aero/glossary/easa/runway) and a direct warning to a flight crew or vehicle [operator](https://avioverse.aero/glossary/easa/operator);

(2) It should function and be controlled independently of any other visual system on the aerodrome;

(3) Its visual aid components, i.e. lights, should be designed to conform with the relevant specifications in Chapter M; and

(4) Failure of the ARIWS or part of it should not interfere with normal aerodrome operations. To this end, provision should be made to allow [air traffic services](https://avioverse.aero/glossary/easa/air-traffic-services) (ATS) unit to partially or entirely shut down the system.

(c) Where an ARIWS is installed at an aerodrome, information on its characteristics and status should be provided to the appropriate aeronautical information services (AIS) for promulgation in the [aeronautical information publication (AIP)](https://avioverse.aero/glossary/easa/aeronautical-information-publication) with the description of the aerodrome surface [movement](https://avioverse.aero/glossary/easa/movement) guidance and control system and markings.

\[Issue: ADR-DSN/4]

IR · CS ADR-DSN.T.921 — Regulation (EU) No 139/2014 · ED Decision 2017/021/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.