What does 14 CFR Part 43 regulate?

• A. Maintenance, Preventive Maintenance, Rebuilding, and Alteration
• B. Certification: Pilots, Flight Instructors, and Ground Instructors
• C. Airworthiness Directives
• D. Operating Certain Small Aircraft Without a Medical Certificate

Answer: (A)

Part 43 is about how aircraft are kept safe through maintenance and alterations. It covers who may perform maintenance, the standards and methods to use, and the required records to document work and confirm an aircraft is airworthy after any service. This ensures that any work affecting safety is done properly and traceably.

Airworthiness directives, for example, come from a different part (responsible for how mandated equipment or actions are issued). Certification of pilots and instructors is covered by another part, and medical certificate requirements likewise belong to other parts. So the statement that matches Part 43 describes maintenance, preventive maintenance, rebuilding, and alteration.