Which of the following is a procedure for positive exchange of flight controls?

The procedure for a positive exchange of flight controls requires clear communication and acknowledgment between pilots to ensure that both are aware of who is in control of the aircraft at any given moment. Verbal communication of control transfer is essential because it minimizes the risk of misunderstandings or misinterpretations that could occur if either pilot assumes control without clear acknowledgment. By stating who is taking control and receiving confirmation, this practice fosters safety and enhances situational awareness within the cockpit.

Other options may have their contexts but do not effectively establish an unequivocal transfer of control. Switching seats during a flight could introduce risks without a structured command process, and physical maneuvering of controls simultaneously does not verify who is in charge. Lastly, using hand signals during twilight hours could lead to ambiguity and miscommunication, especially given the potential for visual limitations.