According to 14 CFR part 107, the responsibility to inspect the small UAS to ensure it is in a safe operating condition rests with the

Why: This is a published FAA UAG sample knowledge-test question. Section 107.49 places the preflight inspection duty on the remote pilot-in-command, who must inspect the small UAS to ensure it is in a condition for safe operation before each flight — described in AC 107-2A's preflight inspection guidance.

• A visual observer's role is to assist in seeing and avoiding other air traffic; part 107 does not place the preflight inspection duty on this role.
• Owning the aircraft does not by itself carry the § 107.49 inspection duty — that duty belongs to whoever is acting as remote pilot-in-command for the flight, even if a different person owns the aircraft.