AAIB investigation to Velos V3, (UAS registration N/A)

Loss of control of UA, Onllwyn, Neath Port Talbot, 17 March 2025

• From: Air Accidents Investigation Branch
• Published: 12 February 2026

• Category: Unmanned Aircraft Systems (UAS)
• Report type: Bulletin - Correspondence investigation
• Date of occurrence: 17 March 2025
• Aircraft type: Velos V3
• Location: Onllwyn, Neath Port Talbot
• Registration: N/A

During a first flight after fitting an ADS-B Mode S transponder, the UA experienced a series of erroneous flight channel inputs and fell to the ground. It is likely that an ADS-B transponder fitted to the UA contributed to a level of interference. The Civil Aviation Authority’s Operational Authorisation process did not fully assess the usage of the transponder in this instance. The operator has changed the configuration of the UAS for future flights with a lower-power Electronic Conspicuity (EC) device, and the regulator is in the process of updating their Operational Authorisation (OA) and UAS risk assessment for operations in the Specific Category regarding use of EC devices.

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Velos V3, UAS registration N/A 02-26

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Glossary of abbreviations

Published 12 February 2026