Air Accidents Investigation Branch
September 12
08:56
2024
The UA lost power whilst being flown in an area that excluded the general public. This was likely due to the battery becoming detached in flight and it is possible that the battery was not fully latched in place. The same model of battery has been known to swell when it starts to deteriorate which can compromise its secure retention within the UA. Such swelling can be detected before flight by checking that the battery can sit firmly on a flat surface without rocking, and the operator has highlighted the need for such a check to its pilots.