Which of the following is NOT required to be on board the aircraft when flying?

In this context, it is important to understand the requirements for documents that must be on board an aircraft when a pilot is flying. The correct answer indicates that evidence of currency with a flight review is not required to be carried in the aircraft.

While pilots must comply with the regulations regarding flight reviews and ensure that they are current to act as pilot-in-command, there is no specific regulation that mandates having documentary evidence of this flight review on board during flight. Instead, it is the pilot's responsibility to have completed the necessary flight review within the required time frame and to maintain their own records of such currency.

On the other hand, the other options all point to documents that are explicitly required by regulations to be available when piloting an aircraft. This ensures that the pilot has the required credentials and evidence of compliance with legal and safety standards while operating the aircraft.