As far as I know the FAA has never officially recognized the AMA as a "Nationwide Community Based Organization" so there is no official set of CBO rules to comply with section 336 in order to be exempt from any future FAA regulations.. So is there actually any FAA regulation/rule/advisory other then AC 91-57 that the FAA can use before they finally publish their "model aircraft" rules or recognize the AMA and it's CBO rules?