When can you assign the altitude vacated during refueling operations?

The correct approach in assigning the altitude vacated during refueling operations is determined primarily by safety considerations and the need to maintain separation between aircraft. The appropriate time to assign the vacated altitude is after the refueling aircraft has reported reaching the next IFR altitude. This ensures that the refueling operation has been completed and that the aircraft is safely clear of its previous altitude before allowing other aircraft to occupy that space.

This procedure helps to prevent potential conflicts that could arise if another aircraft were to be assigned the vacated altitude while the refueling operation is still ongoing, or if the aircraft is still in the process of maneuvering. Assigning the altitude only after confirmation that the refueling aircraft has successfully transitioned to a new altitude reinforces a safe operational environment.