How often must a commercial pilot complete a flight review or proficiency check to act as pilot in command under 14 CFR Part 91?

A commercial pilot must complete a flight review or proficiency check every 24 calendar months to act as pilot in command under 14 CFR Part 91. This requirement is designed to ensure that pilots maintain their skills and knowledge, which is crucial for safe flying practices. The flight review typically includes at least an hour of ground instruction covering the regulations, aircraft operations, and other pertinent topics, followed by a minimum of an hour of flight time in which the pilot demonstrates their ability to perform various maneuvers and maneuvers relevant to the aircraft they will be operating. This periodic assessment plays a vital role in enhancing flight safety and ensuring that pilots stay updated with current aviation practices and regulations.