I didn't pull from the actual CFR, but, from the FCC UAS section[1]:
Don't fly within 5 miles of an airport unless you contact the airport and control tower before flying
But, for example, there is an airport near me that is not a controlled field, yet it is marked as a no-fly zone in DJI firmware. Some helipads are marked also even though they are not controlled fields
I paraphrased the rest from memory, left out the 55lb restriction(55lbs is pretty reasonable I think). If you are flying large(>55lbs) model aircraft, there is a clause that permits it as long as it is designed, inspected, tested, and flown within 'community-based safety guidelines'
I assumed it was, "Don't fly in regulated airspace" which would make sense. Some airspaces KSEA have a floor of 2,000ft pretty near them since planes pretty much always take off north/south
I paraphrased the rest from memory, left out the 55lb restriction(55lbs is pretty reasonable I think). If you are flying large(>55lbs) model aircraft, there is a clause that permits it as long as it is designed, inspected, tested, and flown within 'community-based safety guidelines'
[1]https://www.faa.gov/uas/model_aircraft/