- Commercial Parts
- Date issued
- Office of Primary Responsibility
This advisory circular (AC) explains how you can use the new provision in Title 14 of the Code of Federal Regulations (14 CFR) §§ 21.1(a)(3), 21.8, 21.9(a)(4), and 21.50(c) for commercial parts.
This AC is not mandatory and does not constitute a regulation. In it, we describe an acceptable means, though it is not the only means, to comply with 14 CFR §§ 21.8, 21.9(a)(4), and 21.50(c) for commercial parts. However, if you use the means described in this AC, you must follow it entirely.
- AC 21-45 (PDF)