What do flight attendants fill out when the auto-closeout function is unavailable for departing flights?

When the auto-closeout function is unavailable for departing flights, flight attendants fill out the ePIN. The ePIN process is essential for documentation and tracking purposes, ensuring that all necessary information is accurately recorded when automated systems are not operational. This manual entry helps maintain the integrity of flight data, allowing for proper accountability and communication within the airline's operational structure.

In contrast, other options like the Flight Log primarily deal with recording details about the flights for operational records and may not directly serve the purpose of closing out flights when automated functions fail. Similarly, the Service Report focuses on capturing customer service details rather than operational closure tasks, while the Check-in Form pertains more to the passenger check-in process rather than the post-flight closure activities. Thus, the ePIN is specifically designed for situations where automation is not available, making it the correct choice in this scenario.