---
title: "CS HPT-DSN.E.400 Applicability — Certification Specifications and Guidance Material for Heliport Design (CS-HPT-DSN) — Issue 1, Aerodromes · Avioverse"
description: "The purpose of the obstacle limitation surfaces is to define the airspace around heliports so as to permit intended helicopter operations to be conducted…"
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-hpt-dsn/chapter-e-obstacle-limitation-surfaces-and/cs-hpt-dsn-e-400"
---

# CS HPT-DSN.E.400 Applicability

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

Official sources: [EASA Easy Access Rules (opens in a new tab)](https://www.easa.europa.eu/en/document-library/easy-access-rules/easy-access-rules-aerodromes) · [EUR-Lex 2014/139 (opens in a new tab)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32014R0139)

IR Implementing rule

## CS HPT-DSN.E.400 Applicability

The purpose of the [obstacle](https://avioverse.aero/glossary/easa/obstacle) limitation surfaces is to define the airspace around heliports so as to permit intended helicopter operations to be conducted safely.

IR · CS HPT-DSN.E.400 — Regulation (EU) No 139/2014 · ED Decision 2019/012/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in CHAPTER E — OBSTACLE LIMITATION SURFACES AND REQUIREMENTS](https://avioverse.aero/regulations/easa/aerodromes/cs-hpt-dsn/chapter-e-obstacle-limitation-surfaces-and)

Consolidated from the EASA Easy Access Rules (revision 13 Mar 2026, extracted 2 Nov 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.