Regulation (EU) 2018/395
When a balloon carries more than 19 passengers, at least one additional crew member shall be present on board the balloon in addition to the flight crew as required pursuant to points (a) and (b) of point BOP.ADD.300 to assist passengers in the event of an emergency. That additional crew member shall be appropriately experienced and trained.
ED Decision 2018/004/R
BOP.ADD.415 Fitness relating to deep water diving and blood donation