When must a pilot have their current pilot certificate in personal possession or readily accessible in the aircraft?

A pilot must have their current pilot certificate in personal possession or readily accessible in the aircraft anytime they are acting as pilot in command or as a required crewmember. This requirement ensures that the pilot can demonstrate their qualifications and legal authority to operate the aircraft when necessary, providing a clear line of accountability and safety in aviation operations.

This mandate aligns with the principles of aviation regulations aimed at ensuring that all operating pilots meet the standards required for the safe operation of aircraft. The regulation reflects the responsibility that pilots hold for their actions and the importance of being prepared to validate their credentials at any time during flight operations.

Other scenarios mentioned, such as acting as a crew chief, only carrying passengers, or flying solo across state lines, do not encompass the comprehensive requirement for maintaining accessibility to a pilot certificate while undertaking any role that necessitates adherence to pilot responsibilities.