What is one primary limitation of UAS operations under Part 107?

One primary limitation of UAS operations under Part 107 is the restriction on flying over people. This regulation is designed to protect the safety of individuals on the ground by preventing the risk of injury in case of a drone malfunction or accident. The rules limit the ability of remote pilots to conduct operations in crowded areas or scenarios where people may not be able to take evasive action should an incident occur.

While there are specific provisions and waivers that can allow for operations over people, the fundamental guideline under Part 107 generally prohibits this to promote safety. This is particularly relevant in urban environments or during events where large gatherings occur.

The other options present different regulations but do not capture a primary limitation in the same way. UAS can be flown over certain bodies of water, can be operated at night with the right waivers in place, and the altitude restriction of 400 feet is generally for safety and maintaining separation from manned aircraft rather than being a limitation that specifically targets the operation over people as a primary concern.