On 3 June 2021, CEN and ASD-STAN, the dedicated body for standardization in the aerospace sector, launched the public enquiry for prEN 4709-001 ‘Aerospace series - Unmanned Aircraft Systems - Part 001: Product requirements and verification’. This document provides technical specification and verification method to support compliance with Commission Delegated Regulation (EU) 2019/945 of 12 March 2019 on unmanned aircraft systems (UAS, popularly known as ‘drones’) and on third-country operators of UAS. This includes compliance with product requirements for all UAS authorised to operate in the ‘open’ category (class C0, C1, C2, C3 and C4 UAS).