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]