Which CFR part provides airworthiness directives?

• A. Part 39
• B. Part 43
• C. Part 61
• D. Part 67

Answer: (A)

Airworthiness directives address unsafe conditions in aircraft or their components and are defined and governed by 14 CFR Part 39. This part gives the FAA authority to issue ADs and makes complying with those directives mandatory for aircraft operating in the U.S. It also explains how ADs are issued and what actions they may require, such as inspections, repairs, replacements, or modifications, along with any specified time frames.

The other parts govern different areas of aviation: maintenance and required records are covered under Part 43, pilot certification under Part 61, and medical certification under Part 67. So the part that provides airworthiness directives is Part 39.