Aircraft Certification Service (AIR) Draft Advisory Circulars (ACs) Open for Comment
| Document Title: | AC 20-170A, Integrated Modular Avionics (IMA) |
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| Summary: | This advisory circular (AC) provides guidance for demonstrating compliance with applicable airworthiness requirements for integrated modular avionics (IMA) systems installed in a product, part, or appliance. |
| Documents for Download: | Draft Document Comment Matrix |
| Comments Due: | May 29, 2026 |
| How to Comment: | Email Comments to: Jaime.O.Valdivia@faa.gov and 9-AVS-TechWriters@FAA.gov |
| Document Title: | AC 20-194, Airworthiness Approval of Air Traffic Control Radar Beacon System (ATCRBS)/Mode S Transponders |
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| Summary: | The Federal Aviation Administration (FAA) is issuing this advisory circular (AC) to guide applicants seeking airworthiness approval for installations of Air Traffic Control Radar Beacon System/Mode Select (ATCRBS/Mode S) transponders certified to Technical Standard Order (TSO)-C112c or later, Air Traffic Control Radar Beacon System/Mode Select (ATCRBS/Mode S) Airborne Equipment. |
| Documents for Download: | Draft Document Comment Matrix |
| Comments Due: | July 6, 2026 |
| 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, May 28, 2026