Sec. 73.1520  Operation for tests and maintenance.

    (a) Broadcast stations may be operated for tests and maintenance of 
their transmitting systems on their assigned frequencies using their 
licensed operating power and antennas during their authorized hours of 
operation without specific authorization from the FCC.
    (b) Licensees of AM stations may operate for tests and maintenance 
during the hours from 12 midnight local time to local sunrise, if no 
interference is caused to other stations maintaining a regular operating 
schedule within such period. No AM station licensed for ``daytime'' or 
``specified hours'' of operation may broadcast any regular or scheduled 
programs during this period of test and maintenance operation.
    (c) Licensees of AM stations may obtain special antenna test 
authorizations, and operate under the provisions described in 
Sec. 73.157, to operate with nighttime facilities during daytime hours 
in conducting directional antenna field strength and antenna proof of 
performance measurements.

[ 43 FR 32783 , July 28, 1978, as amended at  45 FR 6401 , Jan. 28, 1980]