Sec.  87.349   Frequencies.

   (a) The frequency assigned to an aeronautical utility station at an airport
   served by a control tower, RCO or FAA flight service station is the
   frequency used by the control tower for ground traffic control or by the
   flight service station for communications with vehicles. In addition to the
   ground control frequency, an aeronautical utility station at an airport
   served by a control tower or RCO may be assigned the tower or RCO frequency
   if the assignment is specifically approved by the FAA as provided for in
    Sec. 87.347(c). The frequencies assigned are normally from the band
   121.600–121.925 MHz.

   (b) The frequency assigned to the unicom is available to aeronautical
   utility stations on a noninterference basis at airports which have a
   part-time control tower, part-time RCO or part-time FAA flight service
   station and a unicom.

   (c) At airports which have a unicom but no control tower, RCO or FAA flight
   service station, the frequency assigned to the unicom is available to
   aeronautical utility stations on a noninterference basis. The frequencies
   available for assignment to unicoms are described in subpart G of this part.

   (d) At airports which have no control tower, RCO, flight service station or
   unicom, the frequency 122.900 MHz is available for assignment to
   aeronautical utility stations.

   [ 55 FR 30464 , July 26, 1990, as amended at  55 FR 30908 , July 30, 1990]