Sec.  95.215   (R/C Rule 15) Do I have to limit the length of my communications?

   (a) You must limit your R/C communications to the minimum practical time.

   (b) The only time your R/C communications may be a continuous signal for
   more than 3 minutes is when operation of the device requires at least one or
   more changes during each minute of the communications.

   (c) Your R/C station may transmit a continuous signal without modulation
   only if:

   (1) You are using it to operate a model aircraft device; and

   (2) The presence or absence of the signal operates the device.

   (d) If you show that you need a continuous signal to insure the immediate
   safety of life of property, the FCC may make an exception to the limitations
   in this rule.