§ 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 § 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.

   (e) The frequency 978.0 MHz is authorized for Universal Access
   Transceiver data transmission.

   (f) The Commission will assign frequency 1090 MHz for use by
   aeronautical utility mobile stations for ground vehicle identification
   and collision avoidance after coordination with the FAA, subject to the
   following conditions:

   (1) The applicant must notify the appropriate Regional Office of the
   FAA prior to submission to the Commission of an application for a new
   station or for modification of an existing station. Each application
   must include the FAA Regional Office notified and date of notification.

   (2) Eligibility is restricted to airport operators holding an FAA
   Airport Operating Certificate, and other entities approved by the FAA
   on a case-by-case basis to use frequency 1090 MHz for use by
   aeronautical utility mobile stations for ground vehicle identification
   and collision avoidance;

   (3) No more than two hundred 1090 MHz aeronautical utility mobile
   stations will be authorized at one airport;

   (4) Licenses are limited to only those locations that are within the
   vicinity of an FAA ASDE-X multilateration system or ADS-B equipment,
   and/or where the primary purpose for seeking transmit authorization is
   to provide surface data to aircraft and air traffic control
   authorities.

   (5) Message transmission rates are limited as indicated in the table
   below:
   ADS-B Message Rate when moving Rate when stationary
   Surface Position Message (Types 5, 6, 7, 8) Every 0.4 to 0.6 seconds
   Every 4.8 to 5.2 seconds.
   Aircraft Operational Status (Type 31) Every 4.8 to 5.2 seconds Every
   4.8 to 5.2 seconds.
   Aircraft Identification and Type (Type 2) Every 4.8 to 5.2 seconds
   Every 9.8 to 10.2 seconds.

   [ 55 FR 30464 , July 26, 1990, as amended at  55 FR 30908 , July 30, 1990;
    71 FR 70680 , Dec. 6, 2006;  78 FR 61207 , Oct. 3, 2013]

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