True or False: Visual Line of Sight (VLOS) is determined by the crew's ability to see the air vehicle.

The statement is true because Visual Line of Sight (VLOS) refers specifically to the requirement that the remote pilot or observer must maintain a clear and unobstructed view of the Unmanned Aircraft System (UAS) at all times during operation. This means that the crew’s ability to see the air vehicle is fundamental to adhering to safety regulations and ensuring that the operator can control the UAS effectively. Maintaining VLOS allows the operator to avoid obstacles and respond to any potential hazards promptly, ensuring a safer flying experience.

The other possible responses suggest a different understanding of VLOS. One implies that it may only apply under certain conditions, such as optimal weather, which does not recognize that VLOS is a consistent requirement regardless of weather. Another option disregards the impact of crew visibility entirely, which contradicts the definition of VLOS itself, as the crew must be able to see the aircraft to maintain control and situational awareness. These misconceptions highlight the importance of understanding VLOS as an essential safety practice in UAS operation.