Way I read that is that it's night time flying?
I agree - that along with Section 17-31 seemed to contradict itself, and it prompted me to call. According to the person I spoke with (filling in for the acting Director, who was out) the 2nd sentence says it's prohibited at any time without prior approval. He agreed it was a bit unclear, but 'the County lawyers wrote it.' Hopefully I should get some guidance later this week.