AAIB investigation to Malloy Aeronautics T005 (UAS registration n/a)

Loss of control after flight mode change, White Waltham Airfield, Berkshire, 2 April 2024

• From: Air Accidents Investigation Branch
• Published: 13 February 2025

• Category: Unmanned Aircraft Systems (UAS)
• Report type: Bulletin - Correspondence investigation
• Date of occurrence: 2 April 2024
• Aircraft type: Malloy Aeronautics T005
• Location: White Waltham Airfield, Berkshire
• Registration: n/a

During a test flight to validate a flight control software update, the UA climbed and veered left. It then descended and struck two unoccupied General Aviation (GA) aircraft, coming to rest underneath the second. The UA was destroyed.

The operator’s investigation identified that the UA lost control due to the software commanding more thrust than needed for level flight. Several technical, process and human performance factors contributed to the accident.

The operator has taken thirteen safety actions to prevent reoccurrence.

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Malloy Aeronautics T005, UAS Registration n/a 02-25

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Glossary of abbreviations

Published 13 February 2025