What should pilots do when lining up for takeoff if they are waiting for ATC approval?

When lining up for takeoff and awaiting Air Traffic Control (ATC) approval, it is essential for pilots to turn on the appropriate lights. This action enhances visibility and safety on the runway, both for other aircraft and for ground personnel. Specifically, activating the landing lights and taxi lights signals readiness for takeoff and makes the aircraft more conspicuous, reducing the risk of accidents during this critical phase.

Turning off all lights, engaging autopilot, or adjusting seating position are not standard practices in this situation. While these actions may have their place during other phases of flight, they do not directly enhance safety or communication in the context of preparing for takeoff while waiting for ATC clearance. Therefore, ensuring that the appropriate lights are illuminated is the correct course of action for pilots in this scenario.