---
title: "CS HPT-DSN.B.110 Helicopter clearways — Certification Specifications and Guidance Material for Heliport Design (CS-HPT-DSN) — Issue 1, Aerodromes · Avioverse"
description: "Applicability: When provided, a helicopter clearway should be located beyond the end of the FATO."
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-hpt-dsn/chapter-b-helicopter-operating-areas/cs-hpt-dsn-b-110"
---

# CS HPT-DSN.B.110 Helicopter clearways

Certification Specifications and Guidance Material for Heliport Design (CS-HPT-DSN) — Issue 1 · Regulation (EU) No 139/2014 · EAR revision 13 Mar 2026

IR Implementing rule

## CS HPT-DSN.B.110 Helicopter clearways

(a) Applicability: When provided, a [helicopter clearway](https://avioverse.aero/glossary/easa/helicopter-clearway) should be located beyond the end of the FATO.

(b) Characteristics:

(1) The width of a helicopter clearway should not be less than that of the associated [safety area](https://avioverse.aero/glossary/easa/safety-area) (see Figure B-1).

(2) The ground in a helicopter clearway should not project above a plane having an upward slope of 3 per cent, commencing at the periphery of the FATO.

(3) An object situated in a helicopter clearway, which may endanger helicopters in the air, should be regarded as an [obstacle](https://avioverse.aero/glossary/easa/obstacle) and should be removed.

IR · CS HPT-DSN.B.110 — Regulation (EU) No 139/2014 · ED Decision 2019/012/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in CHAPTER B — HELICOPTER OPERATING AREAS](https://avioverse.aero/regulations/easa/aerodromes/cs-hpt-dsn/chapter-b-helicopter-operating-areas)

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.