Which publication contains the NPRM for Airworthiness Directives?

• A. AC 39-6 Summary of Airworthiness Directives
• B. FAR Part 39
• C. Federal Register
• D. Aircraft Maintenance Manual

Answer: (C)

Notice of Proposed Rulemaking is part of how federal agencies propose rules and gather public feedback. For airworthiness directives, the NPRM is published in the Federal Register, the official journal of the U.S. government that carries rules, proposed rules, and notices. This publication process opens the AD to public comment before it becomes final, ensuring transparency and input from stakeholders.

The other items don’t fit this purpose. An advisory circular like AC 39-6 summarizes ADs but isn’t where proposed rules are published. The regulation itself, found in FAR Part 39, defines the authority and framework for ADs but is not the venue for publishing the NPRM. The Aircraft Maintenance Manual is a manufacturer’s maintenance guide, not a regulatory publication.