Which document is correctly identified as mandatory to be onboard prior to flight?

• A. Airframe and engine logbooks
• B. Pilot's medical certificate
• C. Air traffic control clearance
• D. Pilot's operating handbook

Answer: (A)

The main idea here is demonstrating the aircraft’s airworthiness status before flight. The airframe and engine logbooks contain the maintenance history, including required inspections, major repairs, alterations, and compliance with airworthiness directives. When you’re preparing to fly, these records show that maintenance has been performed and documented, and they provide the basis for confirming that the aircraft is current and airworthy. Having them onboard ensures you can verify, and present if needed, that the aircraft meets all maintenance requirements before takeoff. While other documents such as the airworthiness certificate, registration, and operating limitations are also important, the logbooks specifically document whether the aircraft has been maintained properly, which is why they’re identified as the mandatory-onboard item in this context.