47 C.F.R. § 73.6017 Digital Class A TV station protection of Class A TV and digital Class A TV stations.
Title 47 - Telecommunication
An application for digital operation of an existing Class A TV station or to change the facilities of a digital Class A TV station will not be accepted if it fails to protect authorized Class A and digital Class A stations in accordance with the requirements of §74.793 (b) through (d) and §74.793(g) of this chapter. This protection must be afforded to applications for changes in other authorized Class A and digital Class A stations filed prior to the date the digital Class A application is filed. [69 FR 69330, Nov. 29, 2004]
Title 47: Telecommunication
PART 73—RADIO BROADCAST SERVICES
Subpart J—Class A Television Broadcast Stations
§ 73.6017 Digital Class A TV station protection of Class A TV and digital Class A TV stations.

