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

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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 .
[53 80 FR 28940 , Aug. 1, 1988, as amended at  57 FR 45750 , Oct. 5, 1992]