Sec. 87.421  Frequencies.

    The Commission will assign VHF frequencies after coordination with 
the FAA. Frequencies in the following bands are available to control 
towers and RCOs. Channel spacing is 25 kHz.

118.000-121.400 MHz
121.600-121.925 MHz
123.600-128.800 MHz
132.025-135.975 MHz

    (a) The frequency 123.100 MHz is available for use by control towers 
and RCOs at special aeronautical events on the condition that no harmful 
interference is caused to search and rescue operations in the locale 
involved.
    (b) Frequencies in the bands 200.0-285.0 and 325.0-405.0 kHz will 
only be assigned to control towers and RCOs authorized to operate on at 
least one VHF frequency, unless a showing has been made that elimination 
of VHF service will not adversely affect life and property in the air.
    (c) Frequencies in the band 121.600-121.925 MHz are available to 
control towers and RCOs for communications with ground vehicles and 
aircraft on the ground. The antenna heights shall be restricted to the 
minimum necessary to achieve the required coverage. Channel spacing is 
25 kHz.
    (d) 121.500 MHz: emergency and distress only.
[ 53 FR 28940 , Aug. 1, 1988, as amended at  55 FR 30464 , July 26, 1990]