ISO 5305-2024 PDF

Full title and description

ISO 5305:2024 — Noise measurements for UAS (unmanned aircraft systems). This International Standard specifies methods for recording the time history of instantaneous sound pressure around rotor‑powered UAS (maximum take‑off mass less than 150 kg), and gives requirements and recommendations for test facilities, measurement configurations and procedures for multirotor and single‑rotor aircraft in hover, vertical take‑off/landing and horizontal cruise.

Abstract

This document defines recommended and required practices for acoustic measurement of rotor‑powered unmanned aircraft systems (UAS) with MTOM < 150 kg. It covers three types of test facilities (anechoic chambers, anechoic wind tunnels and outdoor environments), measurement positioning and time‑history sound‑pressure recording, and test configurations to reduce meteorological influence. The standard explicitly excludes tilt‑rotor and tilt‑wing UAS and does not itself serve as a noise certification or regulatory procedure.

General information

• Status: Published.
• Publication date: 29 January 2024 (Edition 1, 2024‑01).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.020 (Aircraft and space vehicles — general).
• Edition / version: Edition 1 (2024).
• Number of pages: 49 pages (ISO publication).

Scope

ISO 5305:2024 applies to acoustic measurement methods for rotor‑powered UAS with maximum take‑off mass less than 150 kg. The standard provides requirements and recommendations for three testing environments — anechoic chambers, anechoic wind tunnels and outdoor test sites — and for measurement configurations in hover, vertical take‑off/landing and horizontal cruise. It may be used for multi‑rotor and single‑rotor UAS but excludes tilt‑rotor and tilt‑wing architectures; it is intended for standardised measurement and reporting and does not itself constitute a noise certification or regulatory procedure.

Key topics and requirements

• Defined measurement objectives: recording time history of instantaneous sound pressure around the UAS.
• Test facility requirements and recommendations for three environments: anechoic chambers, anechoic wind tunnels and outdoor sites (with guidance to minimise meteorological effects).
• Measurement configurations for hover, vertical take‑off/landing (VTOL) and horizontal cruise, including microphone placement and reference positions.
• Applicability to multirotor and single‑rotor UAS with MTOM < 150 kg; exclusion of tilt‑rotor/tilt‑wing UAS.
• Recommendations to minimise meteorological and environmental influences on outdoor measurements.
• Reference to UAS categorization/classification (ISO 21895) for consistency in applying mass/architecture categories.

Typical use and users

Primary users are UAS manufacturers, acoustic test laboratories, research organisations, environmental noise consultants and standards committees. Regulators and certification bodies may use the standard as a harmonised measurement method reference, although the standard itself is not a certification procedure. It is also useful to product designers evaluating noise performance during development.

Related standards

ISO 21895 (Categorization and classification of civil unmanned aircraft systems) is explicitly referenced for UAS classification used in measurement context. ISO 5305 complements broader acoustics standards and aircraft noise measurement practice (for example various ISO acoustics series standards) and sits under the work of ISO/TC 20/SC 16 on unmanned aircraft systems.

Keywords

UAS, unmanned aircraft systems, drone noise, acoustic measurement, sound pressure time history, anechoic chamber, wind tunnel, MTOM < 150 kg, rotor noise, test methods.

FAQ

Q: What is this standard?

A: ISO 5305:2024 is an International Standard that specifies methods and recommendations for measuring noise from rotor‑powered unmanned aircraft systems (UAS) with a maximum take‑off mass under 150 kg.

Q: What does it cover?

A: It covers measurement facility requirements (anechoic chambers, anechoic wind tunnels, outdoor sites), microphone positioning and recording of time‑history instantaneous sound pressure for hover, VTOL and horizontal cruise configurations, and guidance to reduce meteorological effects. It excludes tilt‑rotor and tilt‑wing UAS and is not a noise certification procedure.

Q: Who typically uses it?

A: UAS manufacturers, acoustic test labs, researchers, environmental noise consultants and standards developers use it for standardised acoustic testing and reporting. Regulators may reference it as a measurement method but would use separate certification/regulatory procedures for compliance.

Q: Is it current or superseded?

A: ISO 5305:2024 is a current International Standard published in January 2024 (Edition 1). Users should check national adoptions or amendments (for example published national adoptions) for local publication dates or national forewords.

Q: Is it part of a series?

A: It is part of ISO work on unmanned aircraft systems under ISO/TC 20/SC 16 and references related UAS standards such as ISO 21895 for categorization. It complements other ISO acoustics standards used for aircraft and environmental noise measurement.

Q: What are the key keywords?

A: UAS, drone acoustics, noise measurement, sound pressure, anechoic chamber, wind tunnel, MTOM < 150 kg, rotor noise.