Final answer:
A Visual Observer is required to be under the direct supervision of the Remote Pilot in Command (Remote PIC) during small UAS operations, maintaining a visual line of sight on the UAS and providing situational awareness.
Step-by-step explanation:
The crew member who is required to be under the direct supervision of the Remote Pilot in Command (Remote PIC) when operating a small Unmanned Aircraft System (UAS) is the Visual Observer (VO). The VO assists the Remote PIC by maintaining a visual line of sight (VLOS) of the UAS without the use of any aids other than corrective lenses. Additionally, the VO must be able to communicate with the Remote PIC at all times to provide situational awareness, helping to maintain the safe operation of the UAS in respect to other aircraft, people, and property.
The Remote PIC holds the ultimate responsibility for the operation and safety of the UAS flight. It is essential that the VO and any other crew members coordinate effectively and maintain clear communication with the Remote PIC to ensure adherence to air safety regulations and policies during the UAS flight operations.