What type of knowledge must be endorsed in the logbook for an additional aircraft class rating?

For obtaining an additional aircraft class rating, the logbook must reflect the endorsement of aeronautical knowledge. This refers specifically to the understanding of the principles of flight, aircraft operations, regulations, and performance specifics related to the new class of aircraft.

Aeronautical knowledge encompasses various critical topics, including navigation, weather interpretation, communications procedures, and the operation of specific aircraft systems. This comprehensive understanding is vital to ensure that pilots can safely and effectively operate different types of aircraft, especially those that may have significantly different handling characteristics or procedural requirements compared to what they are accustomed to.

While technical knowledge relates to the specifics of the aircraft systems and configurations, and practical knowledge involves hands-on flying abilities, aeronautical knowledge provides the foundational theoretical understanding necessary for safe piloting and regulatory compliance across different aircraft types.