47 C.F.R. § 87.423
Hours of operation.
Cite as 47 C.F.R. § 87.423 (2026)
The control tower must render a communications service 24 hours a day unless the Commission determines, in coordination with the NTIA IRAC, that reduced hours of service will not adversely affect life and property in the air. [63 FR 68958, Dec. 14, 1998]