---
title: "Usability factor — EASA Definition · Avioverse"
description: "CS ADR-DSN.A.002, Regulation (EU) No 139/2014: ‘Usability factor’ means the percentage of time during which the use of a runway or system of runways is…"
url: "https://avioverse.aero/glossary/easa/usability-factor"
---

# Usability factor

EASA defines “Usability factor” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

> ‘Usability factor’ means the percentage of time during which the use of a runway or system of runways is not restricted because of the crosswind component.

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)