400 foot? NOPE
If you're on the side of the fence that there is a 400 foot limit you can drop that case and move on to your next.
The AMA is in possession of a letter, from the FAA, on FAA letterhead that states in part that members operating under the AMA safety code are not subject to a 400 foot limit.
They are required to operate safely, not endanger the NAS, see and avoid and all that good stuff but we are not under a 400 foot limitation.
This should be disseminated sooner rather than later but it's a fact.