---
title: "PART 5 — Requirements for a class C4 Unmanned aircraft system — Annex to Delegated Regulation (EU) 2019/945, UAS · Avioverse"
description: "A class C4 UAS bears the following label on the UA in a visible manner:"
url: "https://avioverse.aero/regulations/easa/uas/annex-to-delegated-regulation-eu-2019-945/powers-and-recitals/part-5-requirements-for-a-class-c4-unmanned-aircraft-system"
---

# PART 5 — Requirements for a class C4 Unmanned aircraft system

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

IR Implementing rule

## PART 5 — Requirements for a class C4 Unmanned aircraft system

A class C4 UAS bears the following label on the UA in a visible manner:

\[Figure or form omitted from this preview — available in the Avioverse workspace library.]

A class C4 UAS shall comply with the following:

(1) have an MTOM of less than 25 kg, including [payload](https://avioverse.aero/glossary/easa/payload);

(2) be safely controllable and manoeuvrable by a [remote pilot](https://avioverse.aero/glossary/easa/remote-pilot) following the [manufacturer](https://avioverse.aero/glossary/easa/manufacturer)’s instructions, as necessary under all anticipated operating conditions including following the failure of one or, if appropriate, more systems;

(3) not be capable of automatic control modes except for flight stabilisation assistance with no direct effect on the trajectory and lost link assistance provided that a pre-determined fixed position of the flight controls in case of lost link is available;

(4) be placed on the market with manufacturer’s instructions providing:

(a) the characteristics of the UA including but not limited to the:

class of the UA

UA mass (with a description of the reference configuration) and the [maximum take-off mass](https://avioverse.aero/glossary/easa/maximum-take-off-mass) (MTOM);

general characteristics of allowed payloads in terms of mass, dimensions, interfaces with the UA and other possible restrictions;

equipment and software to control the UA remotely; and a description of the behaviour of the UA in case of a loss of the command and control link;

(b) clear operational instructions;

(c) maintenance instructions;

(d) troubleshooting procedures;

(e) operational limitations (including but not limited to meteorological conditions and day/[night](https://avioverse.aero/glossary/easa/night) operations); and

(f) appropriate description of all the risks related to UAS operations;

(5) include an information notice published by EASA providing the applicable limitations and obligations, in accordance with Implementing Regulation (EU) 2019/947.

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.