I'm assuming you are flying at an AMA club. If so, contact Chad Budreau at AMA. He is now taking on a lot of the government relations roles and I'm sure he'd be happy to contact your club president and let him know that 400' is not what he seems to think it is. It is still part of an advisory circular, not a hard rule. Chad has been in all the meetings and knows a lot about what is going on. My club hosted the sUAS head Hoot Gibson a couple of weeks ago and it was a good opportunity to really pick his brain.

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