---
title: "PART 15 — Maximum sound power level per class of UA (including transition periods) — Annex to Delegated Regulation (EU) 2019/945, UAS · Avioverse"
description: "UA class MTOM m in gram Maximum sound power level LWA in dB as from entry into force as from 2 years after entry into force as from 4 years after entry…"
url: "https://avioverse.aero/regulations/easa/uas/annex-to-delegated-regulation-eu-2019-945/powers-and-recitals/part-15-maximum-sound-power-level-per-class-of-ua-including-transition-periods"
---

# PART 15 — Maximum sound power level per class of UA (including transition periods)

Annex to Delegated Regulation (EU) 2019/945 · Regulations (EU) 2019/947 and 2019/945 · EAR revision 29 Jun 2026

IR Implementing rule

## PART 15 — Maximum sound power level per class of UA (including transition periods)

| UA class  | MTOM m in gram  | Maximum [sound power level LWA](https://avioverse.aero/glossary/easa/sound-power-level-lwa) in dB |                                        |                                        |
| --------- | --------------- | ------------------------------------------------------------------------------------------------- | -------------------------------------- | -------------------------------------- |
|           |                 | as from entry into force                                                                          | as from 2 years after entry into force | as from 4 years after entry into force |
| C1 and C2 | m < 900         | 85                                                                                                | 83                                     | 81                                     |
| C2        | 900 ≤ m < 4 000 | 85 + 18,5 lg                                                                                      | 83 + 18,5 lg                           | 81 + 18,5 lg                           |

Where ‘lg’ is the base 10 logarithm.

IR — Regulations (EU) 2019/947 and 2019/945 · Regulation (EU) 2020/1058 · UAS Easy Access Rules · EAR revision 29 Jun 2026

[All rules in Powers and recitals](https://avioverse.aero/regulations/easa/uas/annex-to-delegated-regulation-eu-2019-945/powers-and-recitals)

Consolidated from the EASA Easy Access Rules (revision 29 Jun 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.