Sport_pilot,
I'm not quite sure what you are looking at. You state that the only things requiring license is broadcast and aviation radios. If you are speaking about licenses to operate the radio then you are correct, there is no requirement by the FCC for us to have a license to operate our R/C radios. But this is not what we are referring to in the servicing of these radios. The FCC has not done away with thier requirements that I posted earlier in this thread. FCC Regulation 95.221 specifically covers having your R/C radio serviced. If interested you can find the actual regulation here http://edocket.access.gpo.gov/cfr_20...7cfr95.221.pdf

There is no confusion in the FCC regulations on this matter. If a crystal is changed in a RC transmitter in the United States it needs to be done by a person who is certified to work on these radios. This is required in order for the radio to be properly re-tuned to the correct frequency after the new crystal is in the radio. This is done for a very specific reason, and it has nothing to do with the possibility of interfering with somebody else's plane (although this is pretty bad in itself). The 72 Mhz frequencies that we use are very near other frequencies used for commercial purposes, television broadcasting immediately comes to mind although there are other uses as well. If a crystal is changed in a radio and it is not properly re-tuned there is a very real possibility that the radio will start to interfere with the commercial operations on adjacent frequencies. If this happens I can assure you that a visit from FCC officials isn't too far behind that. Fines for interfering with a commercial operation like this can range up to $10,000.