What is one of the required aircraft documents?

Weight and balance documentation is a required aircraft document because it ensures that the aircraft is properly loaded to operate safely within its performance limits. This documentation provides crucial information, such as the aircraft's empty weight, weight of cargo, passengers, and fuel, as well as the center of gravity (CG) calculations. Proper weight and balance are vital for maintaining controlled flight and preventing issues such as stalling or difficulty in handling the aircraft.

While other options may be important for flight operations, they do not fall under the category of required aircraft documents in the same way that weight and balance documentation does. For example, an insurance policy is typically a matter of business or personal responsibility, and the flight plan, while important for operational purposes, is not a document that is required to be on board the aircraft during flight. Appropriate licenses are necessary for pilots but are not documents pertaining directly to the aircraft itself. Therefore, weight and balance documentation stands out as an essential requirement for ensuring safety and compliance with aviation regulations.