What should be checked if an aircraft has been left unattended?

When an aircraft has been left unattended, it is essential to repeat preflight checks to ensure the safety and readiness of the aircraft for departure. Preflight checks encompass a range of critical inspections, including verifying the aircraft's systems, fuel status, safety equipment, and overall condition. By conducting these checks again, the crew can confirm that nothing has changed while the aircraft was unattended that could compromise safety or operational readiness. This process helps prevent any potential issues that may have arisen during the unattended period, ensuring the aircraft is still in compliance with safety regulations and ready for the next flight.

While checking passenger counts, secured exits, and operational functionality are all important aspects of ensuring safety and efficiency, they do not encompass the comprehensive nature of preflight checks, which serve as a holistic evaluation of the aircraft's readiness for operation. Consequently, repeating preflight checks becomes a priority to guarantee that everything is in order before the aircraft is prepared for takeoff.