Which regulation would you consult for the specific requirements of an aircraft maintenance manual?

The regulation that outlines the specific requirements for an aircraft maintenance manual is FAR Part 43. This part of the Federal Aviation Regulations provides the standards for maintenance, preventative maintenance, and alterations of aircraft and details what needs to be included in maintenance manuals. Specifically, it mandates that maintenance manuals must encompass necessary information for maintaining the aircraft in an airworthy condition, including approved procedures and standards.

In contrast, FAR Part 91 addresses general operating and flight rules, primarily for pilots and operations of the aircraft, while FAR Part 25 pertains to the airworthiness standards for transport category airplanes, dealing with design and performance requirements rather than maintenance specifics. FAR Part 21 governs the certification procedures for products and their continued airworthiness, including production and airworthiness standards but does not specifically detail maintenance manual requirements. Therefore, for someone looking for the rules that specifically pertain to maintenance manuals, FAR Part 43 is the correct reference.