---
title: "List of abbreviations — Certification Specifications and Guidance Material for Heliport Design (CS-HPT-DSN) — Issue 1, Aerodromes · Avioverse"
description: "(used in CS-HPT-DSN) ASPSL arrays of segmented point source lighting APAPI abbreviated precision approach path indicator CS-ADR-DSN certification…"
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-hpt-dsn/powers-and-recitals/list-of-abbreviations"
---

# List of abbreviations

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

## List of abbreviations

(used in CS-HPT-DSN)

| ASPSL      | arrays of segmented point source lighting                                                                               |
| ---------- | ----------------------------------------------------------------------------------------------------------------------- |
| APAPI      | abbreviated precision approach path indicator                                                                           |
| CS-ADR-DSN | [certification specifications](https://avioverse.aero/glossary/easa/certification-specifications) for aerodromes design |
| FATO       | final approach and take-off area                                                                                        |
| HAPI       | helicopter approach path indicator                                                                                      |
| HFM        | helicopter ([aircraft](https://avioverse.aero/glossary/easa/aircraft)) flight manual                                    |
| LDAH       | [landing distance available](https://avioverse.aero/glossary/easa/landing-distance-available) (helicopters)             |
| LP         | luminescent panel                                                                                                       |
| MTOM       | maximum take-off mass                                                                                                   |
| PAPI       | precision approach path indicator                                                                                       |
| RTODAH     | rejected take-off distance available (helicopters)                                                                      |
| TLOF       | touchdown and lift-off area                                                                                             |
| TODAH      | take-off distance available (helicopters)                                                                               |
| UCW        | undercarriage width                                                                                                     |

IR — Regulation (EU) No 139/2014 · ED Decision 2019/012/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in Powers and recitals](https://avioverse.aero/regulations/easa/aerodromes/cs-hpt-dsn/powers-and-recitals)

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.