---
title: "CS HPT-DSN.F.640 Flight path alignment guidance lighting system — Certification Specifications and Guidance Material for Heliport Design (CS-HPT-DSN) — Issue 1, Aerodromes · Avioverse"
description: "Applicability: Where provided at a heliport, a flight path alignment guidance lighting system (or systems) should indicate the available approach and/or…"
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-hpt-dsn/chapter-f-visual-aids/cs-hpt-dsn-f-640"
---

# CS HPT-DSN.F.640 Flight path alignment guidance lighting system

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.F.640 Flight path alignment guidance lighting system

(a) Applicability: Where provided at a [heliport](https://avioverse.aero/glossary/easa/heliport), a flight path alignment guidance lighting system (or systems) should indicate the available approach and/or departure path direction(s).

(b) Location:

(1) The flight path alignment guidance lighting system should be in a straight line along the direction(s) of approach and/or departure path on one or more of the TLOF, FATO, [safety area](https://avioverse.aero/glossary/easa/safety-area) or any suitable surface in the immediate vicinity of the FATO, TLOF or safety area.

(2) If combined with a flight path alignment guidance [marking](https://avioverse.aero/glossary/easa/marking), then as far as is practicable, the lights should be located inside the ‘arrow’ markings.

(c) Characteristics:

(1) A flight path alignment guidance lighting system should consist of a row of three or more lights spaced uniformly over a total minimum distance of 6 m. Intervals between lights should not be less than 1.5 m and should not exceed 3 m.

(2) Where space permits, there should be 5 lights. The number of lights and the spacing between these lights may be adjusted to reflect the space available.

(3) If more than one flight path alignment system is used to indicate the available approach and/or departure path direction(s), the characteristics for each system are typically kept the same (see Figure F-6).

(4) The lights should be steady omnidirectional inset white lights.

(5) The distribution of the lights should be as indicated in Figure F-9, Illustration 5.

(6) A suitable control should be incorporated to allow for adjustment of light intensity to meet the prevailing conditions and to balance the flight path alignment guidance lighting system with other heliport lights and general lighting that may be present around the heliport.

IR · CS HPT-DSN.F.640 — Regulation (EU) No 139/2014 · ED Decision 2019/012/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in CHAPTER F — VISUAL AIDS](https://avioverse.aero/regulations/easa/aerodromes/cs-hpt-dsn/chapter-f-visual-aids)

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.