Flight Coordination Central AN/TSC-61( ) provides facilities for air traffic coordination, warning air defense identification and in-flight assistance with an assigned zone of responsibility on a continuous basis. Altitude, time and distance flight plan data for airborne aircraft can also be coordinated. It provides facilities to establish air-to-ground radio communications with frequency modulated equipment in the very high frequency range and with amplitude-modulated (AM) equipment (pilot command control) in the ultra-high frequency, very high frequency and high frequency (HF) ranges. Facilities are also included for telephone, radio-teletype for ground-to-ground radio communications with associated air fields and ground installations.