Sec. 25.136  Operating provisions for earth station networks in the 1.6/
          2.4 GHz mobile-satellite service.

    In addition to the technical requirements specified in Sec. 25.213, 
earth stations operating in the 1.6/2.4 GHz Mobile-Satellite Service are 
subject to the following operating conditions:
    (a) User transceiver units associated with the 1.6/2.4 Mobil-
Satellite service may not be operated on civil aircraft unless the earth 
station has a direct physical connection to the aircraft Cabin 
Communication system.
    (b) User transceiver units in this service are authorized to 
communicate with and through U.S. authorized space stations only. No 
person shall transmit to a space station unless the user

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transceiver is first authorized by the space station licensee or by a 
service vendor authorized by that licensee, and the specific 
transmission is conducted in accordance with the operating protocol 
specified by the system operator.
    (c) Any user transceiver unit associated with this service will be 
deemed, when communicating with a particular 1.6/2.4 GHz Mobile-
Satellite Service system pursuant to paragraph (b) of this section, to 
be temporarily associated with and licensed to the system operator or 
service vendor holding the blanket earth station license awarded 
pursuant to Section 25.115(d). The domestic earth station licensee 
shall, for this temporary period, assume the same licensee 
responsibility for the user transceiver as if the user transceiver were 
regularly licensed to it.
[ 59 FR 53327 , Oct. 21, 1994, as amended at  61 FR 9945 , Mar. 12, 1996]

                             Space Stations