Sec.  87.185   Scope of service.

   (a) Aircraft stations must limit their communications to the necessities of
   safe, efficient, and economic operation of aircraft and the protection of
   life and property in the air, except as otherwise specifically provided in
   this part. Contact with an aeronautical land station must only be attempted
   when the aircraft is within the serivce area of the land station. however,
   aircraft stations may transmit advisory information on air traffic control,
   unicom or aeronautical multicom frequencies for the benefit and use of other
   stations monitoring these frequencies in accordance with FAA recommended
   traffic advisory practices.

   (b) Aircraft public correspondence service must be made available to all
   persons  without  discrimination  and  on  reasonable demand, and must
   communicate  without  discrimination  with any public coast station or
   mobile-satellite  earth  station authorized to provide aircraft public
   correspondence service.

   (c) Aircraft public correspondence service on maritime mobile frequencies
   may only be carried by aircraft stations licensed to use maritime mobile
   frequencies and must follow the rules for public correspondence in part 80.

   (d) Aircraft public correspondence service on Aeronautical Mobile-Satellite
   (R) Service frequencies may only be carried on aircraft earth stations
   licensed  to use Aeronautical Mobile-Satellite (R) frequencies and are
   subject to the rules for public correspondence in this part. Aircraft public
   correspondence service on Maritime Mobile-Satellite Service frequencies may
   only  be  carried  by aircraft earth stations licensed to use Maritime
   Mobile-Satellite  frequencies  and are subject to the rules for public
   correspondence in part 80.

   [ 53 FR 28940 , Aug. 1, 1988, as amended at  57 FR 45750 , Oct. 5, 1992]