75 mhz.
Not saying they are right, but seemingly the RC car and boat folks aren't worried. If you have never been to an RC car event, these guys change crystals between races. Most racers have five or six sets of crystals so that they can avoid conflicts as they move from heat to heat. Guess they'll kill the RC goose before fliers do.
I deal with FCC rules and regulations every day. The FCC does not have the time/man power to keep the rules and regulations up to date. The rules written for RC in Part 95 were written at a time when the FCC required changes to be made by a FCC licensed technician. The rules about technicians have been changed, but Part 95 has not. So the queston is, "what is a Licensed service center?" Who licenses them? My guess is they are "certified" by manufacturers to do warranty work.
For my part, all of this isn't a problem. I fly (legally) on 50 mhz (Extra Class) and have the commercial ticket.