Section 2. Frequencies
Provide control lines for air-ground communications and Category I monitoring on all VORs and VORTACs as follows:
- Provide independent transmitting and receiving lines to the controlling FSS when a remote communications outlet is associated with the VOR or the VORTAC.
- Provide one line when a remote communications outlet has only a 122.1 MHz receiver.
- Control lines are not required if line costs considerably exceed normal costs and cannot be justified in a particular case.
Frequency 255.4 MHz must be the UHF channel for en route communications with military aircraft and must be provided as necessary to meet military en route requirements.