Sec.  87.237   Scope of service.

   (a) The communications of an aeronautical multicom station (multicom) must
   pertain to activities of a temporary, seasonal or emergency nature involving
   aircraft in flight. Communications are limited to directing or coordinating
   ground  activities  from the air or aerial activities from the ground.
   Air-to-air communications will be authorized if the communications are
   directly  connected with the air-to-ground or ground-to-air activities
   described above. Multicom communications must not include those air/ground
   communications provided for elsewhere in this part.

   (b)  If  there  is  not  unicom and an applicant is unable to meet the
   requirements for a unicom license, the applicant will be eligible for a
   multicom license.

   (1) The multicom license becomes invalid when a unicom is established at the
   landing area.

   (2) Multicoms must not be used for ATC purposes other than the relay of ATC
   information between the pilot and air traffic controller. Relaying of ATC
   information is limited to the following:

   (i) Revisions of proposed departure time;

   (ii) Takeoff, arrival flight plan cancellation time;

   (iii) ATC clearances, provided a letter of agreement is obtained from the
   FAA by the licensee of the multicom.

   (3) Communications by a multicom must be limited to the safe and expeditious
   operation of private aircraft, pertaining to the conditions of runways,
   types of fuel available, wind conditions, weather information, dispatching
   or  other  information.  On  a secondary basis, multicoms may transmit
   communictions which pertain to efficient portal-to-portal transit of an
   aircraft such as requests for ground transportation, food or lodging.