Which of the following is considered a suspicious activity that must be reported to the Pilot in Command (PIC)?

The identification of a suspicious item is critical in maintaining safety and security within aviation operations. This is because the presence of such an item may pose a potential threat to the aircraft, passengers, or crew members. When crew members or other personnel observe an object that appears out of place, could be dangerous, or is otherwise suspicious, it is essential that they report this to the Pilot in Command. The PIC then has the authority and responsibility to assess the situation, take necessary precautions, or enact emergency protocols as needed.

Reporting suspicious items is part of the broader security protocol designed to ensure the safety of everyone on board. The other scenarios listed, such as passengers using mobile devices or complying with directions and noises from the cabin, generally do not indicate an immediate threat and are managed within standard operational procedures. Therefore, the discovery of a suspicious item stands out as a clear and actionable concern that requires prompt attention and reporting.