Aircraft Certification Service (AIR) Draft Advisory Circulars (ACs) Open for Comment
| Document Title: | AC 39-8A, Continued Airworthiness Assessment Methodologies of Powerplant and Auxiliary Power Unit Installations on Transport Category Airplanes |
|---|---|
| Summary: | This advisory circular (AC) describes continued airworthiness assessment methodologies (CAAM) that may be used for products associated with the powerplant or auxiliary power unit (APU) installations on transport category airplanes. |
| Reference: | 14 CFR 21.183, 14 CFR 21.184, 14 CFR 21.25, 14 CFR 21.185, 14 CFR 21.187, 14 CFR 21.190, 14 CFR 21.191, 14 CFR 21.197 |
| Documents for Download: | Draft Document Comment Matrix |
| Comments Due: | November 24, 2025 |
| How to Comment: | Email comments to 9-AVS-TechWriters@faa.gov |
Related Information
- Final Aircraft Certification advisory circulars, other policy documents, and technical standard orders (TSOs) are available on FAA's Dynamic Regulatory System (DRS)
- Advisory Circulars (ACs)
- FAA Regulations
- Orders & Notices
- Policy & Guidance
- To comment on rulemaking documents, please visit the DOT Docket Management System.
Last updated: Thursday, November 13, 2025