Final answer:
False. Both air traffic controllers must coordinate and the receiving controller must have permission from the transferring controller before changing an aircraft's flight parameters.
Step-by-step explanation:
The statement that a receiving controller may change the altitude, heading, speed, or transponder code of an aircraft before it crosses the sector boundary without permission from the transferring controller since radio communication has been transferred is false. Coordination between air traffic controllers is critical for the safety and management of air traffic. Before an aircraft crosses from one control sector to another, the transferring controller must communicate with the receiving controller regarding any potential changes to the aircraft's flight parameters. This coordination ensures that both controllers are aware of the aircraft's status and that the receiving controller does not make unauthorized changes that could affect the safety of the flight or conflict with other aircraft. In fact, the receiving controller must have permission from the transferring controller before making any changes to the flight's altitude, heading, speed, or transponder code, despite having established radio communication with the aircraft.