RCAPA FAA information and guidlines
FAA Advisory Circulars are not mandatory, but strongly recommended. If they are not followed they could easily become binding FAA rules. The FAA Advisory Circular that has the biggest impact on commercial AP is AC-91-57 as seen below. Click on the AC 91-57 link for a printable file of this document from the FAA.
The FARs link is a good resource to have for all aircraft operators including modelers. Each pilot should be aware of and comply with Temporary Flight Restrictions and Notices to Airmen that may effect your area of operation. Current TFR’s and NOTAM’s are available for viewing by using the FAR’s link.