Which document must a pilot carry when flying?

A pilot must carry a pilot certificate when flying as it serves several essential purposes. The pilot certificate is an official document issued by the relevant aviation authority, confirming that an individual has met the necessary training and testing requirements to operate an aircraft. This includes demonstrating proficiency in both theoretical knowledge and practical flying skills.

The pilot certificate indicates to both the pilot and authorities that the individual is authorized to fly, possessing the qualifications necessary for safe operation. In the event of a regulatory authority inspection or any incident, the pilot's certificate provides proof of eligibility to operate the aircraft, which is crucial for maintaining aviation safety standards.

While other documents such as the flight manual, aircraft registration, and certificate of aircraft airworthiness are important for various aspects of flight operation and aircraft compliance, they do not substitute for the pilot certificate, which specifically verifies the pilot's qualifications to command the flight.