Who is responsible for keeping the logbook and records when an aircraft is undergoing D-level work?

The correct choice is that the responsibility for keeping the logbook and records when an aircraft is undergoing D-level work falls to the Depot FRC, Inter-service, or commercial depot. This is because D-level maintenance, often referred to as depot-level maintenance, involves extensive repair and overhaul work that is generally beyond the capabilities of an operational squadron. These facilities are equipped with specialized tools and skilled personnel capable of performing complex maintenance tasks.

During D-level maintenance, comprehensive documentation is crucial for tracking the work performed on the aircraft, including inspections, repairs, modifications, and any parts that have been replaced. The depot is responsible for maintaining accurate and complete records in the logbook to ensure proper accountability, facilitate future maintenance, and maintain compliance with regulations and standards.

While other roles such as the aircraft technician, squadron maintenance officer, and logbook clerk play important parts in the overall maintenance process, their responsibilities are more specific and do not extend to the broader oversight of logbook and record-keeping during the D-level work, which is under the jurisdiction of the depot-level facilities.