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 normally
   be assigned only to control towers and RCOs authorized to operate on at
   least one VHF frequency. The Commission may assign frequencies in these
   bands to entities that do not provide VHF service in cases where granting
   such an application 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 general air traffic control communications. 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;  63 FR 68958 , Dec. 14, 1998;  69 FR 32886 , June 14, 2004]