Which regulation provides airworthiness standards for an aircraft in the normal category?

The regulation that provides airworthiness standards for an aircraft in the normal category is 14 CFR Part 23. This part specifically outlines the design and construction requirements that must be met for aircraft classified under the normal category, which includes small general aviation airplanes typically used for non-commercial purposes. Part 23 provides criteria related to safety, performance, and operational characteristics, ensuring that the aircraft is suitable for its intended use.

The relevance of this regulation is significant because it establishes the benchmarks for compliance that manufacturers must adhere to during the development of new aircraft or modifications to ensure safety and reliability. Understanding Part 23 is crucial for pilots and maintenance personnel as it directly impacts the operational capabilities and safety standards of normal category aircraft.

The other regulations mentioned do serve important roles in aviation. For example, 14 CFR Part 21 deals with the certification procedures for products and repairs, while 14 CFR Part 43 addresses maintenance, preventative maintenance, and alterations of aircraft. Part 25, on the other hand, outlines standards for transport category large airplanes, which is distinct from the lighter, normal category defined in Part 23. Therefore, Part 23 is the correct reference for airworthiness standards specifically associated with normal category aircraft.