Which technique should a pilot use to scan for traffic to the right and left during straight-and-level flight?

The technique of systematically focusing on different segments of the sky for short intervals is the most effective method for scanning for traffic during straight-and-level flight. This approach allows pilots to allocate their attention to specific sections of the sky in a structured manner, ensuring that no area is overlooked. This method enhances situational awareness by maximizing the chances of detecting other aircraft that may be in proximity, as it engages both the central and peripheral vision strategically.

By breaking the sky into segments and focusing on each for a brief period, pilots create a comprehensive mental picture of their surroundings. This technique also helps to mitigate any potential fixation on one area, allowing for a more dynamic and thorough observation of traffic. It encourages regular scanning habits that can be critical for maintaining safety in the airspace.

Other methods, such as concentrating on movement in peripheral vision, may not provide a full understanding of the aircraft's surroundings. Continuous sweeping can lead to missed aircraft as it lacks the focus needed for effective scanning. Relying solely on instruments does not provide the visual context necessary for identifying nearby planes, which could lead to dangerous situations.