---
title: "Secondary surveillance radar (SSR) — EASA Definition · Avioverse"
description: "Article 2, Regulation (EU) No 923/2012: ‘secondary surveillance radar (SSR)’ means a surveillance radar system which uses transmitters/receivers…"
url: "https://avioverse.aero/glossary/easa/secondary-surveillance-radar"
---

# secondary surveillance radar (SSR)

EASA defines “secondary surveillance radar (SSR)” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

> ‘secondary surveillance radar (SSR)’ means a surveillance radar system which uses transmitters/receivers (interrogators) and transponders;

Article 2 · Standardised European Rules of the Air (SERA) · Regulation (EU) No 923/2012 · Easy Access Rules, 26 Aug 2025 revision · [Read Article 2](https://avioverse.aero/regulations/easa/sera/cover-regulation/powers-and-recital#article-2)

## Defined in the same article

- [accuracy](https://avioverse.aero/glossary/easa/accuracy)
- [advisory airspace](https://avioverse.aero/glossary/easa/advisory-airspace)
- [advisory route](https://avioverse.aero/glossary/easa/advisory-route)
- [aerial work](https://avioverse.aero/glossary/easa/aerial-work)
- [aerobatic flight](https://avioverse.aero/glossary/easa/aerobatic-flight)
- [aerodrome](https://avioverse.aero/glossary/easa/aerodrome)
- [aerodrome control service](https://avioverse.aero/glossary/easa/aerodrome-control-service)
- [aerodrome control tower](https://avioverse.aero/glossary/easa/aerodrome-control-tower)