Which documents must a CPL holder carry on board during operations?

A Commercial Pilot License (CPL) holder is required to carry specific documents while operating an aircraft to ensure compliance with regulatory standards and safety protocols. The key mandatory documents include the CPL holder's license and a valid medical certificate.

The license verifies that the pilot has met the training and examination requirements to operate as a commercial pilot, while the medical certificate confirms that the pilot is physically fit to safely operate an aircraft. Both of these documents are essential for the legality of the flight and the safety of the operation.

Although flight plans and weather briefs are important for operational planning and safety, they are not legally mandated to be carried on board during flight. Personal identification and maintenance logs are also useful but do not fall under the specific regulatory requirements for documents that must be onboard during operations. Therefore, the requirement to carry the license and valid medical certificate makes this the right choice.