47 CFR § 5.81
Discontinuance of station operation
February 16, 2021
In case of permanent discontinuance of operation of a station in the Experimental Radio Service prior to the license expiration date, the licensee shall notify the Commission. Licensees who willfully fail to do so may be subject to disciplinary action, including monetary fines, by the Commission.
[78 FR 25162, Apr. 29, 2013]