Frequency change

A frequency change is an instruction to stop transmitting on the current radio frequency and contact another station on a new one. It is commonly given when you move from one ATS unit or sector to another, such as from Approach to Tower. You normally read back the new frequency, set it correctly, check that the old frequency is no longer active, and then make your first call on the new frequency. If the instruction is conditional, change only at the stated time, altitude, position, or waypoint.