AAIB investigation to Avy Aera 1.5, (UAS registration n/a)
Lift propeller bolt failure and blade loss, Arran War Memorial Hospital, Lamlash, Isle of Arran, 6 May 2022.
Summary:
The UA was hovering at between 50 m to 65 m agl during a demonstration flight, when a rhythmic, lower than normal sound was heard emanating from the UAS. It then dipped and spiralled downwards during which control could not be re-established. The UA hit the ground and was severely damaged. A fatigue failure of a blade attachment bolt caused one of the lift propeller blades to detach in flight.
Download report: