A controller may omit the ground or local control frequency if the controller believes the pilot knows which frequency is in use.Normally, only one ground control frequency is assigned at an airport however, at locations where the amount of traffic so warrants, a second ground control frequency and/or another frequency designated as a clearance delivery frequency, may be assigned.A pilot who has just landed should not change from the tower frequency to ground control frequency until directed to do so by the controller. They are used for issuance of taxi information, clearances, and other necessary contacts between the tower and aircraft or other vehicles operated on the airport.Ground control frequencies are provided to eliminate frequency congestion on the tower (local control) frequency and are limited to communications between the tower and aircraft on the ground and between the tower and utility vehicles on the airport, provide a clear VHF channel for arriving and departing aircraft.The majority of ground control frequencies are in the 121.6 to 121.9 MHz bandwidth.The tower controller will consider that pilots of turbine-powered aircraft are ready for takeoff when they reach the runway or warm-up block unless advised otherwise.Pilots are encouraged to monitor the local tower frequency as soon as practical consistent with other ATC requirements.Unless otherwise advised by the tower, remain on that frequency during taxiing and run-up, then change to local control frequency when ready to request takeoff clearance.Pilots of departing aircraft should communicate with the control tower on the appropriate ground control/clearance delivery frequency prior to starting engines to receive engine start time, taxi and/or clearance information.If incorrect, distorted, or incomplete, makes corrections as appropriate.
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