Bill This is right of the Frequently asked Questions on the Futaba website:
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The applicable Federal Regulation is as follows:

TITLE 47--TELECOMMUNICATION COMMISSION (CONTINUED)
PART 95--PERSONAL RADIO SERVICES

Subpart E--Technical Regulations
Sec. 95.645 Control accessibility.
(a) No control, switch or other type of adjustment which, when
manipulated, can result in a violation of the rules shall be accessible
from the transmitter operating panel or from exterior of the transmitter
enclosure.
(b) An R/C transmitter which incorporates plug-in frequency
determining modules which are changed by the user must be certificated
with the modules. Each module must contain all of the frequency
determining circuitry including the oscillator. Plug-in crystals are not
considered modules and must not be accessible to the user.
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An R/C transmitter which incorporates plug-in frequency
determining modules which are changed by the user must be certificated
with the modules.



IS the 9C certified with this Modual? It works fine in my system just don't want to be a FCC violator.