Where can a pilot look to determine if a plane is approved for flight with the door removed?

The correct answer is found in AC 105.2, Appendix 2, or the aircraft owner's manual because these sources provide specific information regarding the modifications and approved configurations for an aircraft, including guidance on the operational limits when components such as doors are removed. This ensures that pilots have access to official documentation that addresses safety, airworthiness, and operational capabilities in various configurations.

The FAA Flight Manual may contain relevant performance data, but it does not always specify limitations related to removing the door. The Pilot's Operating Handbook is more focused on the aircraft's operating procedures and performance but might not detail changes in flying requirements when modifications like door removal occur. AOPA Guidelines can provide general recommendations and safety tips, but they do not serve as regulatory documentation about specific aircraft configurations. Hence, for questions about structural modifications and aircraft approval for flight with components removed, consulting the aircraft owner’s manual or regulatory appendices is essential.