---
title: "Obstacle-free zone (OFZ) — EASA Definition · Avioverse"
description: "CS ADR-DSN.A.002, Regulation (EU) No 139/2014: ‘Obstacle-free zone (OFZ)’ means the airspace above the inner approach surface, inner transitional…"
url: "https://avioverse.aero/glossary/easa/obstacle-free-zone"
---

# Obstacle-free zone (OFZ)

EASA defines “Obstacle-free zone (OFZ)” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

> ‘Obstacle-free zone (OFZ)’ means the airspace above the inner approach surface, inner transitional surfaces, and balked landing surface and that portion of the strip bounded by these surfaces, which is not penetrated by any fixed obstacle other than a low-mass and frangibly mounted one required for air navigation purposes.

CS ADR-DSN.A.002 · Aerodromes · Regulation (EU) No 139/2014 · Easy Access Rules, 13 Mar 2026 revision · [Read CS ADR-DSN.A.002](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-a-general#cs-adr-dsn-a-002)

## Defined in the same article

- [accelerate-stop distance available (ASDA)](https://avioverse.aero/glossary/easa/accelerate-stop-distance-available)
- [accuracy](https://avioverse.aero/glossary/easa/accuracy)
- [aerodrome](https://avioverse.aero/glossary/easa/aerodrome)
- [Aerodrome beacon](https://avioverse.aero/glossary/easa/aerodrome-beacon)
- [Aerodrome elevation](https://avioverse.aero/glossary/easa/aerodrome-elevation)
- [aerodrome equipment](https://avioverse.aero/glossary/easa/aerodrome-equipment)
- [Aerodrome operator](https://avioverse.aero/glossary/easa/aerodrome-operator)
- [Aerodrome traffic density](https://avioverse.aero/glossary/easa/aerodrome-traffic-density-1)