Under FAR Part 61, which document is necessary for a pilot to legally operate an aircraft?

A valid pilot certificate is necessary for a pilot to legally operate an aircraft under FAR Part 61. This certificate confirms that the pilot has completed the required training, passed the necessary written and practical tests, and meets the regulatory standards for the specific category and class of aircraft they are authorized to fly. It serves as official proof of the pilot's qualifications and competencies, ensuring safety and adherence to aviation regulations.

While personal identification may be needed in various situations and a medical certificate may be required to ensure the pilot's health and fitness to fly, neither is sufficient on its own to legally operate an aircraft. Similarly, a logbook, while an important tool for tracking flight hours and training, does not serve as a legal substitute for a pilot certificate. Thus, having a valid pilot certificate is the fundamental requirement mandated by the FARs for legal operation of an aircraft.