Sec. 25.135  Licensing provisions for earth station networks in the non-
          voice, non-geostationary mobile-satellite service.

    (a) Each applicant for a blanket earth station license in the non-
voice, non-geostationary mobile-satellite service shall demonstrate that 
transceiver operations will not cause unacceptable interference to other 
authorized users of the spectrum, based on existing system information 
publicly available at the Commission at the time of filing, and will 
comply with operational conditions placed upon the systems with which 
they are to operate in accordance with Sec. 25.142(b). This 
demonstration shall include a showing as to all the technical 
parameters, including duty cycle and power limits, under which the 
individual user transceivers will operate.
    (b) Transceiver units associated with the non-voice, non-
geostationary mobile-satellite service may not be operated on civil 
aircraft. All portable or hand-held transceiver units (including 
transceiver units installed in other devices that are themselves 
portable or hand-held) having a receiver operating in the 137-138 MHz 
band shall bear the following statement in a conspicuous location on the 
device: ``This device may not be operated while on board a civil 
aircraft. It must be turned off at all times while on board such an 
aircraft.'' This subsection shall not apply to transceiver units whose 
receivers are incapable of radiating in the 108-137 MHz frequency bands.
    (c) 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 specific transmission is first 
authorized by the space station licensee or by a service vendor 
authorized by that licensee.
    (d) Any transceiver unit associated with this service will be 
deemed, when communicating with a particular non-voice, non-
geostationary mobile-satellite service system pursuant to paragraph (c) 
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 Sec. 25.115(d). The domestic earth station 
licensee shall, for such temporary period, assume the same licensee 
responsibility for such transceiver as if such transceiver were 
regularly licensed to it.
[ 58 FR 68059 , Dec. 23, 1993]