What must be accomplished prior to leaving an aircraft for the night?

Before leaving an aircraft for the night, it is essential to ensure that the exit doors are fully closed. This step is critical for safety reasons, as secure doors prevent unauthorized access to the aircraft and help maintain the integrity of the cabin environment. Fully closing the doors also minimizes the risk of any potential hazards that may arise from having doors left ajar overnight, including aircraft interior safety and security.

While other tasks, such as notifying the ground crew of issues, completing passenger surveys, or conducting pre-flight checks, may be important at different stages of flight operations, the specific requirement of ensuring that all exit doors are properly closed is vital before the crew vacates the aircraft. It is a clear protocol that directly relates to the aircraft's safety when unoccupied.