Where can you locate the Airworthiness Standards for various aircraft categories?

The Airworthiness Standards for various categories of aircraft are primarily outlined in different parts of the Federal Aviation Regulations (FAR). Specifically, FAR Part 23 covers the airworthiness standards for normal category airplanes, which include smaller general aviation aircraft. This part provides the necessary requirements regarding design, performance, and safety for these types of aircraft to be certified as airworthy.

FAR Part 25 actually pertains to transport category airplanes, which are larger, typically commercial aircraft, and would not apply to the normal category that Part 23 covers. FAR Part 21 addresses certification procedures for products and parts, while FAR Part 91 deals with general operating and flight rules but does not specifically outline airworthiness standards for aircraft categories. Therefore, Part 23 is the correct reference for the specific airworthiness standards required for normal category airplanes.